DOCSLIB.ORG

Leading Article Sexuality and Women with Complete Spinal Cord Injury

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Leading Article Sexuality and Women with Complete Spinal Cord Injury Spinal Cord (1997) 35, 136 ± 138 1997 International Medical Society of Paraplegia All rights reserved 1362 ± 4393/97 $12.00 Leading Article Sexuality and women with complete spinal cord injury Beverly Whipple1 and Barry R Komisaruk2 1College of Nursing Rutgers, The State University of New Jersey, 180 University Ave, Newark, NJ 07102; 2Psychology, Rutgers, The State University of NJ, 101 Warren Street, Newark, NJ 07102, USA Keywords: spinal cord injury; sexual aspects; women Introduction There is very little known about sexual response in brain.7 However, women who have been diagnosed as women with SCI.1 Although it is well documented that having `complete' SCI reported to us anecdotally that women with spinal cord injury (SCI) are able to they experience orgasms. menstruate, conceive and give birth,1 the literature This led us to hypothesize that in women with concerning orgasm in women with SCI is scant. complete SCI, there may still exist intact genital Money2 referred to orgasms that people with SCI sensory pathways from the peripheral sensory recep- reported during their dreams; he called these orgasms tors to the brain. This hypothesis is based on studies in `phantom'. The term `phantom orgasm' is still used in laboratory animals that demonstrate multiple sensory the literature and rehabilitation settings today. How- pathways from the genital system to dierent levels of ever, this term is misleading, because it confuses the spinal cord as well as directly to the brain. perception of orgasm, which is real, with the absent or denervated peripheral sensory receptor, which is Nerve Pathways `phantom'. For example, in the case of `phantom limb pain', the pain is real but the limb is `phantom'. Based on nerve recording experiments in laboratory Szasz3 reported that in women with complete SCI rats that map the sensory ®eld of the dierent nerves `although vaginal lubrication may still occur in the pelvic nerve receives sensory input from the vagina response to either touch or mental stimuli, there can and cervix, the hypogastric nerve receives input from be no orgasmic response arising from or detected in the uterus and cervix and the pudendal nerve receives the genitalia' (p 178). This report by Szasz and the input from the clitoral region.8±10 Based on a label `phantom orgasm' do not support the reports of neuroanatomical labeling method, the vagus nerve women with SCI that they experience orgasm in receives input from the uterus and cervix.11 response to genital and non-genital stimulation. In women, the pudendal and pelvic nerves enter the Bregman and Hadley4 interviewed women with SCI spinal cord at the sacral 2 ± 4 level,12,13 whereas the and reported that their descriptions of orgasm were hypogastric nerve ascends in the sympathetic chain and not dierent from the orgasms that they experienced enters the spinal cord at thoracic 10 ± 12 levels.12,13 prior to their injuries. In another survey of 231 women Based on functional studies in laboratory rats, there with SCI,5 the authors reported that half of their is evidence that the hypogastric nerve mediates subjects had experienced orgasms after their injury; physiological responses to vaginocervical stimulation; most of the women reported orgasms in response to that is, analgesia and ovulation can be elicited by this genital stimulation or a combination of genital and stimulation after the pelvic nerves are transected breast stimulation. Kettl et al6 reported the results of a bilaterally. However, when the pelvic nerve transec- survey of 74 women with SCI. In their study, 52% of tion is combined with hypogastric nerve transection, the women reported that they experienced orgasms these responses are attenuated.14 ± 16 after their injury. On the basis of these studies, we hypothesized that In the above-cited studies, the authors fail to report the hypogastric nerve could convey cervical stimula- the level, nature and completeness of the SCI. If the tion-elicited activity to the brain in women with spinal cord injury is incomplete, it is of course possible complete SCI below T-10, since the ®bers of the that there may still exist intact neural pathways that hypogastric nerve enter the spinal cord at T-10 and can carry sensory input from the sexual system to the below. Furthermore, we hypothesized that women with complete SCI above the level of entry of the hypogastric nerve (i.e. injury above T-10) would have Correspondence: B Whipple no sexual response to vaginal or cervical self- Sexuality and women with complete SCI B Whipple and BR Komisaruk 137 stimulation. Therefore, subjects diagnosed as having nication, creativity, and resourcefulness, played a key `complete' SCI were divided into an `upper-level' role in producing a positive sexual self-concept. In this injury group (absence of sensation and voluntary phase of sexual rediscovery, reciprocity in relation- movement below T-9 (n=6)) and a `lower-level' ships was critical in the shift from negatively to injury group (absence of sensation and voluntary positively-perceived sexual readjustment.17 movement starting below T-10 (n=10)). Women The phases of this sexual trajectory, which emerged without SCI comprised a control group (n=5).17 from our study, can be concisely characterized with the sequence: cognitive dissociation, sexual disen- 17 Study of sexual response in women with complete franchisement, and sexual rediscovery. SCI Discussion Three women with `complete' SCI, one as high as T-7 and one woman without SCI self-reported orgasms There are a number of possible explanations for the during the laboratory study. One woman with a report of orgasm in women with `complete' SCI. One complete SCI at T-11 had two self-reported orgasms explanation is that the diagnostic criteria themselves do from vaginal self-stimulation and two self-reported not necessarily imply complete transection of the spinal orgasms from cervical self-stimulation. These were her cord. The American Spinal Injury Association (ASIA) ®rst orgasms since her injury. A participant with criteria for `complete' SCI are based on the complete complete SCI at T-8 self-reported six orgasms in the absence of voluntary movement below the level of SCI laboratory, two from vaginal self-stimulation, one from as well as the complete absence of perception of cervical self-stimulation, and three from breast stimula- pinprick, cotton wisp, and anal digital stimulation tion. A participant with complete SCI at T-7 had one below the level of SCI.20 This diagnosis is not based on self-reported orgasm in the laboratory from cervical direct assessment of the structural integrity of the self-stimulation.17 spinal cord. Therefore, it is possible that the diagnosis During orgasm from vaginal or cervical self- of `complete' SCI according to ASIA criteria could be stimulation, the blood pressure increased in all four valid even though genital and visceral sensory path- women, to at least as great a magnitude in the women ways remain functional, but undetected.17,18 with SCI as in the non-injured woman, but there were A second possible explanation for these ®ndings is only minor or no increases in heart rate in the three that in another study it was demonstrated that women with complete SCI.17 imagery-induced orgasm produced signi®cant eleva- The vaginal or cervical self-stimulation also tions in pain thresholds, heart rate, systolic blood increased pain detection thresholds measured at the pressure and pupil diameter that were not signi®cantly ®ngers (ie above the level of SCI) in the women in dierent from the elevations in the same parameters both the `upper' and `lower' SCI groups, as well as in produced by genital self-stimulated orgasms in the the control group of women without SCI.7,18,19 This same individual women without SCI. That is, women indicates that the sensory input from the sexual system in this study achieved orgasm from imagery alone, can gain access to the brain, even in women in the without any stimulation of their body.21 The women `upper' injury group. with spinal cord injury in the present study reported These ®ndings are particularly surprising since there that they did not use imagery during the genital self- is no known genitospinal nerve (i.e. pelvic, hypogastric stimulation conditions.17 or pudendal) input above T-10, yet women with A third explanation is based on neuroanatomical complete SCI above this level nevertheless showed and functional evidence of a sensory pathway from the responses including orgasm to vaginal and/or cervical sexual system to the brain that bypasses the spinal self-stimulation.17 cord. We hypothesized that this pathway is the vagus A qualitative component of this study identi®ed a nerve. In the rat, after injection of the tracer, characteristic trajectory of changes in sexuality that horseradish peroxidase, into the wall of the cervix were initiated by the SCI. Immediately postinjury, and uterus, the tracer was found in cell bodies of the subjects reported a `shutting down' or `closing up' of nodose ganglion, which is the sensory ganglion of the their sexuality. The women believed that physical vagus nerve.11 To further test this hypothesis, we sexual pleasure was no longer possible for them. A transected bilaterally either the spinal cord or all cognitive awareness and conscious decision not to deal nerves known to respond to genital stimulation (ie the with their sexuality developed. We labeled this a phase genitospinal nerves: pelvic, hypogastric and puden- of `cognitive genital dissociation.'17 dal)22 and tested for responses to vaginocervical After the immediate postinjury period and continu- stimulation. These transections reduced the magni- ing during the rehabilitative process, the women tude of brain-mediated responses to vaginocervical described a loss of their sexuality or a `sexual stimulation (ie vocalization threshold and pupil disenfranchisement'.
Load more

Recommended publications
  • Vaginal Health After Breast Cancer: a Guide for Patients
    Information Sheet Vaginal health after breast cancer: A guide for patients Key points • Women who have had breast cancer treatment before menopause may develop a range of symptoms related to low oestrogen levels, while post-menopausal women may have a worsening of their symptoms. • These symptoms relate to both the genital and urinary tracts. • A range of both non-prescription/lifestyle and prescription treatments is available. Discuss your symptoms with your specialist or general practitioner as they will be able to advise you, based on your individual situation. • Women who have had breast cancer treatment before menopause might find they develop symptoms such as hot flushes, night sweats, joint aches and vaginal dryness. • These are symptoms of low oestrogen, which occur naturally with age, but may also occur in younger women undergoing treatment for breast cancer. These changes are called the genito-urinary syndrome of menopause (GSM), which was previously known as atrophic vaginitis. • Unlike some menopausal symptoms, such as hot flushes, which may go away as time passes, vaginal dryness, discomfort with intercourse and changes in sexual function often persist and may get worse with time. • The increased use of adjuvant treatments (medications that are used after surgery/chemotherapy/radiotherapy), which evidence shows reduce the risk of the cancer recurring, unfortunately leads to more side-effects. • Your health and comfort are important, so don’t be embarrassed about raising these issues with your doctor. • This Information Sheet offers some advice for what you can do to maintain the health of your vagina, your vulva (the external genitals) and your urethra (outlet from the bladder), with special attention to the needs of women who have had breast cancer treatment.
    [Show full text]
  • Download Article
    Advances in Social Science, Education and Humanities Research, volume 356 2nd International Conference on Contemporary Education, Social Sciences and Ecological Studies (CESSES 2019) A New Exploration of the Combined Treatment of Symptoms and Social Work Psychology in Male Sexual Addiction Patients Chengchung Tsai Minyi Li School of Management School of Social Sciences Putian University University of Macau Putian, China Macau, China Abstract—Post-Orgasmic Illness Syndrome (POIS) was progesterone, low cholesterol, low dehydroepiandrosterone, first discovered by Professor Waldinger and Schweitzerl in low cortisol, high prolactin or hypothyroidism. Some cases 2002. After publishing several papers such as "POIS Records encountered by the author team indicate that when the of Emotional, Psychological and Behavioral Changes in Male mother was pregnant in the early years, she or her family had Patients" and "POIS Patients", "Clinical Observation Records smoking habits. Some mothers had long-term use of of Psychological and Behavioral Changes" and "POIS Male contraceptives or were used to eating animal internal organs. Disease Self-reports and Treatment Methods", in this paper, Even some cases were diagnosed as male gynecomastia. the author will cite the views of Chinese medicine practitioners on the treatment of POIS, and hope to provide more practical treatment methods and references for future research. TABLE I. SEVEN GROUPS OF POIS SYMPTOMS FOUND BY WALDINGER AND OTHER MEDICAL TEAMS Keywords—POIS; male; ejaculation; mental state; disorder; Body parts Various local sensations emotion Behavioral symptoms extreme fatigue, exhaustion, palpitations, forgetting words, being too lazy to talk, incoherent, inattention, irritability, I. INTRODUCTION photophobia, depression The main research objects of this paper are journalists, Flu symptoms fever, cold, hot, sweaty, trembling writers and other text workers, as well as creative designers Head symptoms head dizziness, groggy, confused and heavy who take creativity as the selling point as the research object.
    [Show full text]
  • Details of the Available Literature on Sex for Induction of Labour
    Appendix 1: Details of the available literature on sex for induction of labour At term, nipple and genital stimulation have been advocated as a way of naturally promoting the release of endogenous oxytocin. 1 In 2005, a Cochrane Review examined the evidence for breast stimulation as a method for inducing labour and found six trials of 719 women, showing a decrease in the number of women not in labour at 72 hours with nipple stimulation compared with no intervention. 2 However, this finding was only significant among women who already had a favourable Bishop score (a cervical assessment used to predict the success of achieving a vaginal delivery). When breast stimulation was compared with intravenous oxytocin in the review, there was no difference in rates of cesarean delivery, number of women in labour at 72 hours or rates of meconium staining. However, the included studies did not look at time to vaginal delivery as an outcome. Overall, nipple stimulation seems to have minimal or no effect for women with an unripe cervix, but may be helpful for inducing labour in those with a ripe cervix. Few studies have looked at the role of intercourse as a cervical-ripening technique. However, prostaglandin concentrations have been shown to be 10 to 50 times higher in the cervical mucous of pregnant women two to four hours after intercourse, compared with concentrations before intercourse. 3 In a study of 47 women who had sex at term compared with 46 who abstained, there was no significant difference in Bishop scores. On average, the sexually active group delivered four days earlier, which was not considered clinically significant.
    [Show full text]
  • Pregnancy and Breast Cancer
    Pregnancy and Breast Cancer Page 1 of 5 Disclaimer: This algorithm has been developed for MD Anderson using a multidisciplinary approach considering circumstances particular to MD Anderson’s specific patient population, services and structure, and clinical information. This is not intended to replace the independent medical or professional judgment of physicians or other health care providers in the context of individual clinical circumstances to determine a patient's care. Note: Any pregnant patient presenting to MD Anderson should have a Maternal Fetal Medicine (MFM) consult prior to initiation of any treatment. INITIAL EVALUATION Ductal carcinoma See Breast Cancer Non-Invasive algorithm in situ2 (DCIS) (Ductal Carcinoma In Situ) Palpable mass > 2 weeks1 ● History and physical Pathology review: ● Bilateral mammogram with fetal Core biopsy ● ER/PR status shielding/ultrasound of breast and ● HER2 status nodal basins Invasive See Clinical Stages on Pages 2-3 breast cancer Special considerations: ● There should be open communication with the patient, obstetrician, and oncologists (medical, surgical and radiation) ● Surveillance of children exposed in utero to chemotherapeutic agents should be documented ● Surgery will not be performed at MD Anderson post 22 weeks gestation 1 If metastatic disease at diagnosis, individualize treatment with multidisciplinary planning 2 Patients with DCIS should not receive chemotherapy Department of Clinical Effectiveness V8 Approved by The Executive Committee of the Medical Staff on 06/15/2021 Pregnancy and Breast Cancer Page 2 of 5 Disclaimer: This algorithm has been developed for MD Anderson using a multidisciplinary approach considering circumstances particular to MD Anderson’s specific patient population, services and structure, and clinical information.
    [Show full text]
  • Face and Body: Independent Predictors of Women's Attractiveness
    Arch Sex Behav (2014) 43:1355–1365 DOI 10.1007/s10508-014-0304-4 ORIGINAL PAPER Face and Body: Independent Predictors of Women’s Attractiveness April Bleske-Rechek • Carolyn M. Kolb • Amy Steffes Stern • Katherine Quigley • Lyndsay A. Nelson Received: 7 May 2013 / Revised: 10 September 2013 / Accepted: 8 February 2014 / Published online: 15 May 2014 Ó Springer Science+Business Media New York 2014 Abstract Women’s faces and bodies are both thought to women wearing swimsuits than among women wearing their provide cues to women’s age, health, fertility, and personal- original clothes. These results suggest that perceivers attend to ity. To gain a stronger understanding of how these cues are cues of women’s health, fertility, and personality to the extent utilized, we investigated the degree to which ratings of that they are visible. women’s faces and bodies independently predicted ratings of women’s full-body attractiveness. Women came into the lab Keywords Body shape Á Attractiveness ratings Á notknowingthey would bephotographed. InStudy 1 (N = 84), Face Á Body Á Female attractiveness we photographed them in their street clothes; in Study 2 (N = 74), we photographed women in a solid-colored two- piece swimsuit that revealed their body shape, body size, and Introduction breast size. We cropped each woman’s original photo into an additional face-only photo and body-only photo; then, inde- Women’s faces and bodies advertise socially-relevant infor- pendent sets of raters judged women’s pictures. When dressed mation. Women’s faces, for example, provide significant cues intheir originalclothes,women’s face-only ratings werebetter of their health, age, femininity, and personality traits (Booth- independent predictors of full-body attractiveness ratings than royd et al., 2008; Gray & Boothroyd, 2012; Gangestad & weretheirbody-onlyratings.Whencuesdisplayedinwomen’s Scheyd, 2005; Kramer et al., 2012).
    [Show full text]
  • Breast Cancer: Your Emotions, Body Image and Sexual Health
    Form: D-5822 Breast Cancer: Your Emotions, Body Image and Sexual Health What’s inside Your emotions .............................................................................2 Your body image .........................................................................5 Your sexual health .....................................................................7 Resources and contact information .........................................20 Your emotions An encounter with breast cancer can start when you notice a change. It may be a lump or a thickening in the breast. It could be nipple discharge (loss of fluid) or pain. Such uncommon signs may raise thoughts of cancer. The same thoughts of cancer can also start when your doctor becomes concerned after you have a mammogram (a test of the breast using low‑energy x‑rays). The doctor gives you a check‑up. He or she explains that cancer is a possible diagnosis (finding). While waiting for the diagnosis, it is common for patients to feel anxious, worried and to fear the worst. When the doctor tells you that you have breast cancer, your first reaction may be shock. You may feel anxious or even helpless. Questions may arise: • Will I live? • Will I need chemotherapy? • What will I look like after the surgery? This can be a difficult time with changing emotions and everyone reacts in their own way. You may feel you are able to manage or you may feel overwhelmed. It is important to know that coping with your normal feelings often means giving attention to your emotional recovery, as well as to your physical recovery from breast cancer. Common and normal emotions you may be feeling Fear When you feel your life is threatened, it is normal to feel scared.
    [Show full text]
  • Quick Reference Chart for Clinical Breast Examination Normal Breast Lump Change in Volume/Shape
    Quick reference chart for clinical breast examination Clinical breast examination (CBE) Normal breast includes careful history-taking, visual inspection, palpation of both breasts, arm pits and root of the neck as well as educating women on breast self- examination and awareness, particularly on breast lumps. History-taking should include the following: 123 456age at menarche, marital status, parity, Normal female breasts: Note Lateral view of normal female breasts: Note Normal female breasts: Note Normal nippple Inverted nipple, horizontal age at first child birth, history of lactation similar size and shape, similar size and shape, nipples at the same similar size and shape, nipples and areola slit is a normal variation. It and breast-feeding, age at menopause, nipples at the same level, level, normal nipples, areola and skin at the same level, normal should not be diagnosed family history of breast and ovarian normal nipples, areola and nipples, areola and skin as retracted nipple as skin there is no underlying cancers in first degree relatives (mother, lump or other sign of sisters, aunts, grandmothers), history and breast cancer duration of oral contraceptive use, hormone replacement therapy (HRT), Lump treatment for infertility and tobacco use. After taking history, both breasts should be visually inspected, both in the sitting and lying down positions and with arms down and up, for any of the following: swelling, lumps, changes in size and shape, skin dimpling, skin retraction, skin thickening, 789101112skin nodules, skin ulceration, the level of Single, painless, hard lump in Single, painless, hard lump Painless, hard lump in the upper outer quadrant of the left Lobulated hard Large, lobulated hard both nipples, retraction of either nipple, the lower outer quadrant of in the lower quadrants of breast with restricted mobility.
    [Show full text]
  • Pelvic Health After Breast Cancer
    Pelvic Health After Breast Cancer Introduction Has your breast cancer treatment impacted your bladder, sexual and/or pelvic function? Have you found this challenging to discuss with your healthcare team? If so, you are not alone. Anywhere between 50 to 70 per cent of women will experience these kinds of issues after treatment.1 Breast cancer treatments that lead to lower levels of estrogen in the body can induce symptoms similar to menopause. Estrogen is important for vaginal health because it keeps the tissues plump, pliable and lubricated. But hormone treatment, chemotherapy and/or ovary suppression or removal can all decrease estrogen levels in the body. Lower estrogen levels can lead to the thinning of vaginal tissues, vaginal dryness, burning, itching, an increased urge to urinate, the leakage of urine, recurring urinary tract infections, pelvic pressure, discomfort and pain with sexual activity. Collectively, all of these changes are called “genito-urinary syndrome of menopause” (GSM).2 Effects of low estrogen may also cause other menopausal symptoms such as hot flashes, night sweats, mood changes and joint pains.2 Joint pains can also be a troubling side effect and researchers believe that this is caused by estrogen depletion, although we do not yet have clear scientific evidence.3,4 Although the symptoms are similar to menopause, the treatments can be different as estrogen-related medications typically cannot be used in women who have had hormone positive breast cancer.2 There is a lot that you and your healthcare team can do to address these symptoms. Do not hesitate to start the conversation with your family doctor, gynecologist, oncology team, sex therapist or physiotherapist who specializes in pelvic floor issues.
    [Show full text]
  • Infant Feeding - Breast and Nipple Thrush
    Guideline Infant Feeding - Breast and Nipple Thrush 1. Purpose This guideline provides details for the diagnosis and management of women with breast and nipple thrush (Candida) at the Women’s. This guideline/procedure is related to Breastfeeding Policy 2. Definitions Breast and nipple thrush is the over-growth of Candida species, on the nipples and in breast ducts, which can cause significant breast and nipple pain. There are over 20 species of Candida of which Candida albicans is the most common. 3. Responsibilities Maternity and neonatal medical, nursing and midwifery staff need awareness of the condition and to refer women to appropriate care. Lactation consultants and medical staff should be aware of the guideline and be able to treat accordingly. 4. Guideline 4.1 Breast and nipple thrush diagnosis The diagnosis of breast or nipple thrush is usually made after consideration of the mother’s symptoms; for example, mother may complain of ‘nipple pain’ that does not resolve despite improved attachment of the baby to the breast. The pain of maternal thrush infections may lead to early weaning, which can be avoided with early diagnosis and treatment. There may be a history of antibiotic treatment preceding thrush symptoms. This may have been prescribed postnatally, for example, to prevent infection following a caesarean section birth or for mastitis. The mother may have a past history of vaginal thrush. Nipple trauma commonly precedes nipple thrush symptoms. It is assumed that the break in the skin allows organisms to enter. 4.2 Signs and symptoms Nipple/areola Mother may describe burning, stinging nipple pain which continues during and after the feed.
    [Show full text]
  • Breast Changes During Pregnancy
    Breast Changes During Pregnancy During pregnancy, hormones in your body Areola enlarged, are preparing your breasts for lactation. nipple more sensitive You may experience enlargement of the breasts, nipples and areolas. The breast tissue may extend up into the armpit, and Montgomery glands some women may have additional breast tissue (accessory breast tissue) under Nipple the armpit. Areola You may find darkening of the nipples and areolas due to hormones that affect pigmentation of the skin. You may also find veins along your breasts more noticeable due to increased blood supply to your breasts. Small glands on the surface of the areolas called Montgomery’s tubercles will become raised bumps Tips Your breasts will continue to grow throughout the pregnancy. This can cause discomfort and sometimes pain. This can be helped by wearing a well-fitting bra. You may need to change your bra to fit the growth of your breasts every trimester. 54 The milk ducts are growing and being Anatomy of breast Early Pregnancy stretched as they fill with milk early in pregnancy. All this causes your breasts to be more sensitive, particularly your Chest muscle nipples. This may cause you discomfort. Lobes Ducts Nipple Fatty tissue Ribs Colostrum Your breasts may start leaking a yellowish, thick substance known as colostrum. It can happen as early as 14 weeks into your pregnancy. Women who do not experience colostrum secretion in pregnancy still produce milk for their baby after birth. When should you seek medical care? If you notice any of the following, it is advisable to seek medical advice: - new lumps - pain (especially if it locates at one place or gets worse) - redness - skin or nipple changes such as thickening, dimpling or ulcers - any coloured substance (other than colostrum) from your nipple - discrete lump in the armpit ( Please refer to the details of “Breast awareness” in FHS website at http://s.fhs.gov.hk/7g38e) 55 mniocent.
    [Show full text]
  • Male and Female Nipples As a Test Case for the Assumption That Functional Features Vary Less Than Nonfunctional Byproducts
    Male and Female Nipples as a Test Case for the Assumption that Functional Features Vary Less than Nonfunctional Byproducts Ashleigh J. Kelly, Shelli L. Dubbs, Fiona Kate Barlow & Brendan P. Zietsch Adaptive Human Behavior and Physiology e-ISSN 2198-7335 Adaptive Human Behavior and Physiology DOI 10.1007/s40750-018-0096-1 1 23 Your article is protected by copyright and all rights are held exclusively by Springer International Publishing AG, part of Springer Nature. This e-offprint is for personal use only and shall not be self-archived in electronic repositories. If you wish to self-archive your article, please use the accepted manuscript version for posting on your own website. You may further deposit the accepted manuscript version in any repository, provided it is only made publicly available 12 months after official publication or later and provided acknowledgement is given to the original source of publication and a link is inserted to the published article on Springer's website. The link must be accompanied by the following text: "The final publication is available at link.springer.com”. 1 23 Author's personal copy Adaptive Human Behavior and Physiology https://doi.org/10.1007/s40750-018-0096-1 ORIGINAL ARTICLE Male and Female Nipples as a Test Case for the Assumption that Functional Features Vary Less than Nonfunctional Byproducts Ashleigh J. Kelly1 & Shelli L. Dubbs1 & Fiona Kate Barlow1 & Brendan P. Zietsch1 Received: 19 April 2018 /Revised: 16 May 2018 /Accepted: 17 May 2018 # Springer International Publishing AG, part of Springer Nature 2018 Abstract Objectives Evolutionary researchers have sometimes taken findings of low variation in the size or shape of a biological feature to indicate that it is functional and under strong evolutionary selection, and have assumed that high variation implies weak or absent selection and therefore lack of function.
    [Show full text]
  • Breast and Pelvic Anatomy Dwight E
    Breast and Pelvic Anatomy Dwight E. Hooper, MD, MBA The Female Breast This bilateral organ that lies anterior to the pectoral muscles is typically asymmetrical in size. The anatomy of the breasts is quite variable in terms of the overall size including the size and color of the areola (pronounced either: a REE la or air ree O la). Size is also relative in terms of diameter and anterior projection of the nipple. While the breast is often circular in shape, quite often there is a projection of the breasts tissue extending into the axilla. This projection is referred to as the Axillary Tail (of Spence). Beneath the skin of the breast is a layer of corium, and beneath it is what makes the greatest volume of the breast ‐ fat lobules. There is also glandular and stromal tissue within the substance of the breast. Diving from the nipple deep into the breast are lactiferous ducts. Supporting the breasts positioning on the chest are the ligaments of Cooper. Frequently, following repeated extension and retraction of the ligaments of Cooper (during the change in breast size from pregnancy or other instances of dramatic weight/ fat changes) the ligaments become more lax thereby altering the breasts position (pre‐ versus post‐pregnancy/ weight change). The Female Pelvis Description of the female pelvis can be divided into three categories: the bony pelvis, external anatomy, and internal (or surgical anatomy). The bony pelvis consisting of bilateral iliac, ischium, and pubic bones anchored to the sacrum, results in several typical shapes. The shape most often found in adult females is the gynecoid pelvis which is of a configuration most consistent with vaginal childbirth as distinguished from the android (the typical male pelvis) or platypeloid pelvises.
    [Show full text]