The Anterior Pituitary (Adenohypophysis)

Total Page:16

File Type:pdf, Size:1020Kb

The Anterior Pituitary (Adenohypophysis) CHRONOLOGICAL TABLES in alphabetical order THE ADRENAL CORTEX 1563 AD Eustachius described the adrenals: De glandulis quae re­ nibus incumbunt. (His Tabulae anatomicae published by Lancisi in 1714.) 1586-1588 Piccolomineus (Ferrara) and Bauhin (Bale) mentioned the suprarenal glands. 1627 Spigelius talked of the capsulae renales. 1651 Highmore suggested that the suprarenals have an absor­ bent function of exudates from the large vessels. 1716 Montesquieu judged the result of the competition of the Academie des Sciences de Bordeaux: "Quel est l'usage des glands surrenales?" No award was given. 1855 Addison talked "On the constitutional and local effects of disease of the suprarenal capsules". 1856 Brown-Sequard proved in animal experiments that the adrenals are essential for the maintenance of life. 1896 Osler found orally given adrenal extract temporarily effec­ tive in a case of Addison's disease. 1905 Bulloch and Sequeira described patients with adrenogenital syndrome. 1926 P. E. Smith showed that hypophysectomy caused atrophy of the adrenals, which Evans prevented by administration of pituitary extracts. 1927 Hartmann and colleagues confirmed this in adrenalecto­ mized cats; so did Rogoff and Stewart in 1928. 821 A HISTORY OF ENDOCRINOLOGY 1929-1930 Liquid extracts of cortical tissue maintained adrenalecto­ mized cats indefinitely (Hartmann and Brownell; Swingle and Pfiffner). 1930 Rowntree and Greene successfully treated a patient with Addison's disease with Swingle and Pfiffner's extract. 1932 Cushing connected the "polyglandular syndrome" of pituitary basophilism, first described by him in 1912, with pituitary-adrenal hyperactivity. 1933 Loeb treated the abnormal serum electrolytes in Addison's disease with sodium chloride. 1936 The concept of stress introduced by Selye. 1937-1952 Steroid hormones of the adrenal cortex isolated, their structure determined and synthesized (Kendall, Reichstein; Wintersteiner and Pfiffner, et al.) 1942 Isolation of ACTH by Li and Sayers (see also Pituitary Tables) 1946 The general adaptation syndrome described by Selye. 1948 Hench and his colleagues discovered the anti­ inflammatory effect of cortisone (Kendall's compound-E). 1949 Hench, Kendall and Slocumb described the effect of Com­ pound E and of ACTH on rheumatoid arthritis. 1953-1955 Isolation and analysis of the structure of aldosterone achieved (Simpson and Tait, Wettstein and Neher, Reich­ stein and van Euw). Aldosterone synthesized by Wettstein and Schmidlin. 1956 Conn described primary aldosteronism. 1958 Angiotensin suggested by Gross to control aldosterone secretion. 1966 Synthesis of /3-corticotrophin by Schwyzer and Sieber. THE ADRENAL MEDULLA 1805 AD Cuvier defined medulla and cortex of the adrenal gland. 1856 Vulpian's staining method specific for adrenaline. 1886 Felix Fraenkel described a patient with an adrenal tumour and pressor attacks. 1892 Chromaffine cell tumour of the adrenal described by Berdez of Lausanne. 822 CHRONOLOGICAL TABLES 1894 Pressor substances in adrenal extract discovered by Oliver and Schaefer in London and, independently, by Szymono­ wicz and Cybulski in Cracow. 1898-1904 Adrenaline isolated, its structure determined and synthe­ sized (Fuerth and Abel; Takamine and Aldrich; Stolz and Dakin). 1922 Labbe, Tinel and Doumer connected paroxysmal attacks of hypertension with chromaffinomas of the adrenal. 1927 Successful removal of a phaeochromocytoma by C. H. Mayo. 1945 Discovery of noradrenaline (Holtz, Credner and Kronenberg). 1957 Vanilmandelic acid (VMA) found to be a metabolite of catecholamines (Armstrong). ANOREXIA NERVOSA 98-138 AD Soranos described amenorrhoea and anorexia in women. ca. 155 AD Galen described an emaciated condition where a patient could not eat. 1689 Richard Morton gave the first description of anorexia nervosa. 1873 Lasegue described 'l'anorexie hysterique. 1873 Gull described anorexia nervosa and gave its name. 1874 Dejerine described "anorexie mentale". 1934 von Bergmann} claimed successful treatment with anterior 1935 Kylin pituitary gland 1937 Schur and Medvei called it pituitary insufficiency due to disturbance of "correlation". 1948 E. C. Jacobs studied the effect of starvation on sex hormones in the male. 1954 Pedoff and colleagues described hypopituitarism caused by starvation. 1962 Srebnik and Nelson observed reduced pituitary LH con­ centrations in malnutrition. 1969 Dally (London) suggested a three-scale classification: Obsessional (0), hysterical (H) and mixed (M). 823 A HISTORY OF ENDOCRINOLOGY 1973 Besser believed to have shown that the endocrine dysfunc­ tion of AN originates in the hypothalamus. 1976 Beumont and his group found reduced circulating LH levels in AN and reduced response to gonadotrophin­ releasing hormone. 1978 Davies and Lewis showed that male rats and guineapigs lost half of their LE receptors after dietary deprivation; their response to hCG stimulation was also reduced. Functional hypopituitarism may be explained by changes of oestrogen metabolism due to loss of body fat, resulting in excessive LE suppression. This would explain the association between menarche and body weight. THE ANTERIOR PITUITARY (ADENOHYPOPHYSIS) ca. 1365 BC Portrait head of Akhenaten (Pharaoh of Egypt, 18th Dynasty) shows acromegalic features. BC Giants were repeatedly mentioned in the Old Testament. Dwarfs were regarded as misfits. 129-201 AD Galen thought that the pituitary drains the phlegm from the brain to the nasopharynx (refuted in 1660 by Schneider in Wittenberg). 1543 Vesalius described the "glandula pituitaria cerebri exci­ piens". 1660 Schneider refuted Galen's theory. 1670 Lower (Oxford) confirmed Schneider's VIew ex­ peri mentally. 1742 Lieutaud described the pituitary stalk ("tige"). 1760 de Haen mentioned amenorrhoea in a patient with pituit­ ary tumour. 1772 Saucerotte described Sieur Mirbeck (acromegaly). 1778 Soemmering (Goetting en) called gland the "hypophysis cerebri" . 1786 John Hunter described "pigeon's milk". 1822 Alibert described a "geant scrofuleux" (acromegalic). 1838 Rathke described the formation of the pituitary gland. 824 CHRONOLOGICAL TABLES 1840 Mohr described a patient with Froehlich's syndrome. 1851 Niepce (France) noted enlargement of the pituitary in connection with parenchymatous goitre. 1857 Chalk described "partial dislocation of the lower jaw" from an enlarged tongue (acromegaly). 1864 Verga published the first post-mortem report in a case of acromegaly ("prosopectasy"). 1869 Lombroso described "macrosomia" (acromegaly). 1877 Brigidi published the autopsy on Ghirlenzoni, an acromegalic actor, including the histology of a pituitary tumour. 1884 Fritzsche and Klebs (Switzerland) reported on the clinical and post-mortem findings of a patient with "giantism" (acromegaly). 1886 Pierre Marie called the disease "acromegaly". 1887 Minkowski connected acromegaly with a pituitary tumour. 1892 Vassale and Sacchi showed that hypophysectomy affected water and mineral metabolism. 1892 Massalongo (Padova) attributed acromegaly to hyperfunc­ tion of the pituitary. 1893 Caton and Paul (Liverpool) attempted surgical treatment of acromegaly to relieve pressure due to a tumour. 1900-1901 Benda demonstrated the connection between acromegaly and eosinophil adenoma of the anterior pituitary. 1900 Babinski (France) } 1901 Froehlich (Vienna) described dystrophia adiposo­ genitalis. 1906 Cushing 1906-1907 Schloffer (Vienna) operated on a pituitary tumour by the nasal route. 1908 Paulesco (Paris and Bucarest) succeeded in removing ex­ perimentally the anterior lobe of the pituitary, but with fatal results. 1909 B. Aschner showed that hypophysectomy in a growing animal caused dwarfism. 1910 Cushing and his team presented the first experimental evidence of the link between the anterior pituitary and the reproductive organs. 825 A HISTORY OF ENDOCRINOLOGY 1911 Hirsch (Vienna) developed the endonasal surgical approach to the pituitary. 1912 B. Aschner observed atrophy of the thyroid in hypophysectomized puppies and genital hypoplasia. 1913 Glinski (Poland) described post-partum necrosis of the anterior pituitary. 1914 Simmonds described pituitary cachexia (Simmonds' dis­ ease). 1915 Gaines demonstrated pituitary function in lactation. 1916 Erdheim described pituitary dwarfism ("Nanosomia pituitaria"). '1921 Evans and Long showed the effect of anterior lobe extract on the growth rate of rats. 1926 Foster and P. E. Smith found that atrophy of the thyroid and lowered BMR in hypophysectomized animals could be restored by using pituitary homoplastic implants. 1927 P. E. Smith and Engle demonstrated that gonadal activity is maintained by the anterior lobe of the pituitary. 1928 Bernhard Zondek and Aschheim isolated the gonado­ trophic hormones (Prolan A and B) of the anterior pituit­ ary. 1929 Putnam, Benedict and Ted produced experimental acromegaly in dogs by anterior lobe extract injection. 1929 Stricker and Grueter discovered prolactin. 1929 Aron (Strasbourg) and, independently, Loeb and Bassett described the action of TSH of the anterior pituitary. 1930 Houssay and Biasotti succeeded in removing the pancreas in the hypophysectomized dog. 1932 Cushing described pituitary basophilism. 1932 Anderson and Collip described the thyrotrophic hormone (TSH) of the anterior pituitary. 1933 Collip and his team isolated an impure "adrenotropic hormone". 1933 Riddle and colleagues identified and assayed prolactin. 1936 Evans and his group isolated the interstitial cell stimulating hormone (ICSH). 1937 F. G. Young described the diabetogenic hormone. 826 CHRONOLOGICAL
Recommended publications
  • 1-Anatomy of the Pituitary Gland
    Color Code Important Anatomy of Pituitary Gland Doctors Notes Notes/Extra explanation Please view our Editing File before studying this lecture to check for any changes. Objectives At the end of the lecture, students should be able to: ✓ Describe the position of the pituitary gland. ✓ List the structures related to the pituitary gland. ✓ Differentiate between the lobes of the gland. ✓ Describe the blood supply of pituitary gland & the hypophyseal portal system. الغدة النخامية Pituitary Gland (also called Hypophysis Cerebri) o It is referred to as the master of endocrine glands. o It is a small oval structure 1 cm in diameter. o It doubles its size during pregnancy. lactation ,(الحمل) pregnancy ,(الحيض) A women experiences changes in her hormone levels during menstruation But only the pituitary gland will only increase in size during pregnancy .(سن اليأس) and menopause ,(الرضاعة) X-RAY SKULL: LATERAL VIEW SAGITTAL SECTION OF HEAD & NECK Extra Pituitary Gland Position o It lies in the middle cranial fossa. o It is well protected in sella turcica* (hypophyseal fossa) of body of sphenoid o It lies between optic chiasma (anteriorly) & mamillary bodies** (posteriorly). Clinical point: *سرج الحصان Anterior to the pituitary gland is the optic chiasm, so if there was a tumor in the pituitary gland or it was ** Part of hypothalamus enlarged this could press on the chiasm and disrupt the patients vision (loss of temporal field). Extra Pictures The purple part is the sphenoid bone Hypophyseal fossa Pituitary Gland The relations are important Important Relations • SUPERIOR: Diaphragma sellae: A fold of dura mater covers the pituitary gland & has an opening for passage of infundibulum (pituitary stalk) connecting the gland to hypothalamus.
    [Show full text]
  • Endocrinology Review – Adrenal and Thyroid Disorders
    FOCUS: ENDOCRINOLOGY Endocrinology Review – Adrenal and Thyroid Disorders LINDA S. GORMAN, JANELLE M. CHIASERA LEARNING OBJECTIVES This article represents the first of three articles focusing 1. Define endocrinology and list the major endocrine on the endocrine system. The first article will provide glands of the body. you with fundamental theory regarding the endocrine system that will serve as a basis for understanding the 2. Explain how feedback (positive and negative) Downloaded from promotes maintenance of normal levels of next two articles focusing on two specific endocrine hormones. glands, the thyroid and adrenal glands. 3. Differentiate between steroid and peptide hormones with regard to their mechanism of Endocrinology is the branch of medical science that action. deals with the endocrine system, a system that consists 4. Provide examples of peptide and steroid hormones. of several glands located in different parts of the body http://hwmaint.clsjournal.ascls.org/ 5. Explain how endocrine disorders are categorized. that secrete hormones directly into the bloodstream. Although every organ system in the body may respond ABBREVIATIONS: ACTH - adrenocorticotropic hor- to hormones, endocrinology focuses specifically on mone; ADH - antidiuretic hormone; CRH – cortico- endocrine glands whose primary function is hormone tropin releasing hormone; DHEA – dehydroepian- secretion. Major endocrine glands include the pituitary drosterone; FSH - follicle stimulating hormone; GHRH (anterior and posterior), hypothalamus, thyroid, - growth hormone
    [Show full text]
  • Relation of the Anterior Pituitary to Ovarian Function
    University of Nebraska Medical Center DigitalCommons@UNMC MD Theses Special Collections 5-1-1934 Relation of the anterior pituitary to ovarian function Clyde S. Martin University of Nebraska Medical Center This manuscript is historical in nature and may not reflect current medical research and practice. Search PubMed for current research. Follow this and additional works at: https://digitalcommons.unmc.edu/mdtheses Part of the Medical Education Commons Recommended Citation Martin, Clyde S., "Relation of the anterior pituitary to ovarian function" (1934). MD Theses. 621. https://digitalcommons.unmc.edu/mdtheses/621 This Thesis is brought to you for free and open access by the Special Collections at DigitalCommons@UNMC. It has been accepted for inclusion in MD Theses by an authorized administrator of DigitalCommons@UNMC. For more information, please contact [email protected]. e­ .,.,.~, THE RELATION OF THE ANTERIOR PITUITARY TO OVARIAN FUNCTION BY CLYDE S. MARTIN SE!HOR THESIS UNIVERSITY OF NEBRASKA SCHOOL OF MEDICINE APRIL I934 THE RELATIOM OF THE ANTERIOR PITUITARY TO OV ARIAJ.T FUNCTION !n ~be last ten years especially, there has been demonstrated and proved, a definite relationship between the pituitary and the sex glands. This is of importance to every clinician, and gynecologist. In order to understand these various phenomena produced by the internal secretion of the pituitary, it is advisable to give here a brief discussion of the anatomical structure, with slight reference to histology. ANATOMY A~TD HI~TOLOGY The pituitary body is situated in the cranium a.t the base of the brain, surrounded by a bony encasement the sella turcica.
    [Show full text]
  • 2. Endocrine Control of the Oestrous Cycle
    2. ENDOCRINE CONTROL OF THE OESTROUS CYCLE Introduction 2.1 The cyclic changes that occur in the female reproductive tract are initiated and regulated by the hypothalamic-pituitary-ovarian (HPO) axis. Although folliculogenesis occurs independently of hormonal stimulation up until the formation of early tertiary follicles, the gonadotrophins luteinising hormone (LH) and follicle stimulating hormone (FSH) are essential for the completion of follicular maturation and development of mature preovulatory (Graafian) follicles. The sites of production and key functions of the major reproductive hormones in the female rat are summarised in Table 2.1. Pituitary gonadotrophin secretion drives follicular maturation and oestrogen secretion 2.2 Levels of LH and FSH begin to increase just after dioestrus. Both hormones are secreted by the same secretory cells (gonadotrophs) in the pars distalis of the anterior pituitary (adenohypophysis). FSH stimulates development of the zona granulosa and triggers expression of LH receptors by granulosa cells. LH initiates the synthesis and secretion of androstenedione and, to a lesser extent, testosterone by the theca interna; these androgens are utilised by granulosa cells as substrates in the synthesis of oestrogen. Pituitary release of gonadotrophins thus drives follicular maturation and secretion of oestrogen during prooestrus. 2.3 Gonadotrophin secretion by the anterior pituitary is regulated by luteinising hormone-releasing hormone (LHRH), produced by the hypothalamus. LHRH is transported along the axons of hypothalamic neurones to the median eminence where it is secreted into the hypothalamic-hypophyseal portal system and transported to the anterior pituitary. The hypothalamus secretes LHRH in rhythmic pulses; this pulsatility is essential for the normal activation of gonadotrophs and subsequent release of LH and FSH.
    [Show full text]
  • 1 General Overview of the Endocrine System Questions to Be Thinking
    General Overview of the Endocrine System Questions to be thinking about to help organize your learning of the components of the Endocrine System: Anatomy 1) Where are the different hormone producing cells located? 2) What hormone does a particular type of endocrine cell or neuron produce? General Overview of the Endocrine System Questions to be thinking about to help organize your learning of the components of the Endocrine System: Hormones 1) What is their general chemical structure? 2) How does their structure affect their function? 3) Where are they produced? 4) What environmental or physiological stimuli regulate their production and secretion? 5) Is their production and secretion under direct neural or hormonal control? 6) What are their targets? 7) What effects do they produce on their targets? 8) How do they produce their effects on their targets (how is the signal transduced? i.e. receptor mechanisms) 1 Often endocrine cells are clumped together into a well defined gland (e.g. pituitary, thyroid, adrenal, testes, ovaries), but not always (e.g. gut, liver, lung). Often endocrine cells are clumped together into a well defined gland (e.g. pituitary, thyroid, adrenal, testes, ovaries), but not always (e.g. gut, liver, lung). Remember, it's cells that produce hormones, not glands. Although many glands secrete more than one type of hormone, most neurons or endocrine cells only produce one type of hormone (there are a few exceptions). 2 Some Terminology Neurohormone: a hormone that is produced by a neuron Some Terminology All of the hormones we discuss can be classified as belonging to one of 2 general functional categories: 1] Releasing hormone (or factors) — hormone that acts on endocrine cells to regulate the release of other hormones.
    [Show full text]
  • Major Endocrine Glands of the Body Pineal Gland Pituitary Gland
    Pituitary and Thyroid Hormones 1 Topics for today: • Anterior pituitary hormones • Posterior pituitary hormones • Portal system & releasing factors • Structure of thyroid gland • Action of thyroid hormones 2 Major endocrine glands of the body pineal gland pituitary gland parathyroid glands thyroid gland adrenal glands thymus gland pancreas ovaries (female) testes (male) 3 1 Hydrophilic hormone action mechanism cytoplasm Extracellular fluid second messenger hormone Multiple effects in the cell membrane receptor 4 Example: Action of Epinephrine 5 Pituitary/hypothalamus axis ...interaction of nervous system & endocrine system 6 2 Pituitary secretions neurosecretory cells anterior pituitary in hypothalamus - TSH - ACTH - growth hormone posterior pituitary - FSH - oxytocin - luteining hormone - antidiuretic hormone - prolactin 7 Pituitary secretions neurosecretory cells anterior pituitary in hypothalamus - TSH - ACTH - growth hormone posterior pituitary - FSH - oxytocin - luteining hormone - antidiuretic hormone - prolactin 8 Physiologic effects of hormones from the anterior pituitary • TSH - stimulates release of hormones from thyroid • ACTH - stimulates release of hormones from adrenal cortex • growth hormone - stimulate growth of somatic tissues • FSH - stimulates gamete formation and follicle development • luteining hormone - affects corpus luteum & Leydig cells • prolactin - stimulates development of mammary ductules 9 3 Physiologic effects of hormones from the posterior pituitary •ADH - increases reabsorption of water from kidney tubules
    [Show full text]
  • The Endocrine System Dr
    The Endocrine System Dr. Ali Ebneshahidi Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings Endocrine System . The endocrine system interacts with the nervous system to coordinate and integrate body activities by means of hormones . Endocrine tissues and organs secrete hormone into body fluids (mainly blood and lymph) directly using diffusion. Exocrine tissues, such as salivary glands, and sebaceous glands, secrete chemical substances through ducts into an open space. Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings Five major functions of hormones . a) Regulate metabolic processes (e.g. thyroid hormones). b) Control the rate of chemical reactions (e.g. growth hormone). c) Aid in the transport of substances across the cell membrane of target cells (e.g. insulin and glucagon). d) Regulate water and electrolyte balances (e.g. antidiurectic hormone, calcitonin, and aldosterone). e) Play a vital role in reproduction, growth and development (e.g. estrogens , progesterone, and testosterone). Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings Major Endocrine Organs Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings Chemistry of Hormones . Hormones are organic compounds secreted by endocrine glands, that have a potent effect in target cells Two types of hormones: . a) Protein hormones: made of amino acids joined by peptide bonds. fat – insoluble; as a result cannot diffuse across the membrane of target cells . most hormones belong to this group except hormones secreted by the gonads (testis and ovary) and the adrenal cortex. b) Steroid hormones: made of fatty acids using cholesterol as a functional group. Fat-soluble; as a result can diffuse into target cells .
    [Show full text]
  • Endocrine Pathology
    Endocrine Pathology INTRODUCTION I. ENDOCRINE SYSTEM A. Group of glands that maintain body homeostasis B. Functions by release of hormones that travel via blood to distant organs C. "Feedback" mechanisms control hormone release. ANTERIOR PITUITARY GLAND I. PITUITARY ADENOMA A. Benign tumor of anterior pituitary cells B. May be functional (hormone-producing) or nonfunctional (silent) 1. Nonfunctional tumors often present with mass effect. i. Bitemporal hemianopsia occurs due to compression of the optic chiasm. ii. Hypopituitarism occurs due to compression of normal pituitary tissue. iii. Headache 2. Functional tumors present with features based on the type of hormone produced. C. Prolactinoma presents as galactorrhea and amenorrhea (females) or as decreased libido and headache (males); most common type of pituitary adenoma 1. Treatment is dopamine agonists (e.g., bromocriptine or cabergoline) to suppress prolactin production (shrinks tumor) or surgery for larger lesions. D. Growth hormone cell adenoma 1. Gigantism in children-increased linear bone growth (epiphyses are not fused) 2. Acromegaly in adults 1. Enlarged bones of hands, feet, and jaw ii. Growth of visceral organs leading to dysfunction (e.g., cardiac failure) iii. Enlarged tongue 3. Secondary diabetes mellitus is often present (GH induces liver gluconeogenesis). 4. Diagnosed by elevated GH and insulin growth factor-1 (IGF-1) levels along with lack of GH suppression by oral glucose 5. Treatment is octreotide (somatostatin analog that suppresses GH release), GH receptor antagonists, or surgery. E. ACTH cell adenomas secrete ACTH leading to Cushing syndrome (see "Adrenal Cortex" below). F. TSH cell, LH-producing, and FSH-producing adenomas occur, but are rare.
    [Show full text]
  • Anterior Pituitary Hormones
    HYPOTHALAMIC AND ANTERIOR PITUITARY HORMONES Dr. Nisha Department Of Pharmacology HYPOTHALAMIC-PITUITARY RELATIONSHIP HYPOTHALAMIC-PITUITARY RELATIONSHIP . Pituitary gland is connected to hypothalamus by the stalk that contains neurosecretory fibers, capillaries & the hypophyseal portal system that drains the hypothalamus & perfuses the anterior pituitary by a number of releasing factors (RF) or releasing hormones. These hypothalamic releasing factors/hormones stimulate the anterior pituitary to produce & secrete a number of tropic hormones, that in turn stimulate target glands to secrete hormones which finally act on the cells of target organs far away from the site of their release. Pituitary hormone secretions are regulated by negative feedback mechanisms. These pathways are “long” as well as “short” negative feedback pathways. If the hormone secreted affects both the hypothalamus & pituitary, then it makes a long negative feedback loop. If they affect only pituitary, then it is a short negative feedback loop. PITUITARY HORMONES (Overview) GROWTH HORMONE (GH) . GH secretion is high in newborn till 4 yrs of age & starts declining after 25 yrs. Pharmacological Effects of GH: -↑protein synthesis (anabolic) - Positive N2 balance (↑AA uptake in cells) - Anabolic effects are mediated by somatomedins (IGF-1 & IGF-2) - Initially insulin like effects & later anti-insulin effects: ↑blood glucose, ↑FFA mobilization, ketone body formation. - IGF-1 inhibit GH release from ant. pituitary & stimulate GHRIH release from hypothalamus. GH Regulating Factors . GHRH (Growth hormone releasing hormone):- released from hypothalamus, regulate GH release. GHRH analogue: Sermorelin- used as diagnostic agent for testing pituitary GH secretion capability in childhood short stature. GHRIH (Growth hormone release-inhibiting hormone) – Somatostatin It inhibits secretion of GH, TSH, insulin & gastrin.
    [Show full text]
  • The Hypothalamus and the Pituitary Gland
    Human Physiology Course The Hypothalamus and the Pituitary Gland Assoc. Prof. Mária Pallayová, MD, PhD [email protected] Department of Human Physiology, UPJŠ LF April 21, 2020 (11th week – Summer Semester 2019/2020) The Hypothalamic-Pituitary Axis The hypothalamus and pituitary gland form a complex interface between the NS and the endocrine system. (the brain links the pituitary gland to events occurring within or outside the body, which call for changes in pituitary hormone secretion) The brain can influence the activity of neurosecretory cells hormones can influence release of other hormones. This important functional connection between the brain and the pituitary, is called the hypothalamic-pituitary axis. The Pituitary Gland (Hypophysis) is located at the base of the brain and is connected to the hypothalamus by a stalk called the infundibulum it sits in a depression in the sphenoid bone of the skull called the sella turcica is composed of two morphologically and functionally distinct glands connected to the hypothalamus - the adenohypophysis and the neurohypophysis. The Pituitary Gland (Hypophysis) The adenohypophysis consists of the pars tuberalis, which forms the outer covering of the pituitary stalk, and the pars distalis or anterior lobe. The neurohypophysis is composed of the median eminence of the hypothalamus, the infundibular stem, which forms the inner part of the stalk, and the infundibular process or posterior lobe. In adult humans, only a vestige of the intermediate lobe (the pars intermedia) is found as a thin diffuse region of cells between the anterior and posterior lobes. The intermediate lobe (often considered part of the anterior pituitary) synthesizes and secretes melanocyte-stimulating hormone.
    [Show full text]
  • Hypothalamic-Pituitary-Gonadal Axis Social Regulation of Gene
    Social Regulation of Gene Expression in the Hypothalamic-Pituitary-Gonadal Axis Karen P. Maruska and Russell D. Fernald Physiology 26:412-423, 2011. doi:10.1152/physiol.00032.2011 You might find this additional info useful... This article cites 152 articles, 51 of which can be accessed free at: http://physiologyonline.physiology.org/content/26/6/412.full.html#ref-list-1 Updated information and services including high resolution figures, can be found at: http://physiologyonline.physiology.org/content/26/6/412.full.html Additional material and information about Physiology can be found at: http://www.the-aps.org/publications/physiol Downloaded from This infomation is current as of December 15, 2011. physiologyonline.physiology.org on December 15, 2011 Physiology (formerly published as News in Physiological Science) publishes brief review articles on major physiological developments. It is published bimonthly in February, April, June, August, October, and December by the American Physiological Society, 9650 Rockville Pike, Bethesda MD 20814-3991. Copyright © 2011 by the American Physiological Society. ISSN: 1548-9213, ESSN: 1548-9221. Visit our website at http://www.the-aps.org/. REVIEWS PHYSIOLOGY 26: 412–423, 2011; doi:10.1152/physiol.00032.2011 Karen P. Maruska and Social Regulation of Gene Expression in Russell D. Fernald Department of Biology, Stanford University, Stanford, California the Hypothalamic-Pituitary-Gonadal Axis [email protected] Reproduction is a critically important event in every animals’ life and in all vertebrates is controlled by the brain via the hypothalamic-pituitary-gonadal (HPG) axis. In many species, this axis, and hence reproductive fitness, can be profoundly influenced by the social environment.
    [Show full text]
  • The Hypothalamo-Hypophyseal System and the Pituitary Gland
    The hypothalamo-hypophyseal system and the pituitary gland Dr. Zsuzsanna Tóth Semmelweis University, Dept. of Anatomy, Histology and Embryology Homeostatic integration within the hypothalamus Endocrine system The hypothalamo-hypophyseal system- neuroendocrine system Neurosecretion is a special feature in the hypothalamo-hypophyseal system release of neurohormones neurosecretory cell Ernst and Berta Scharrer, 1928 Béla Halász Halasz-knife János Szentágothai Identification of different neurohormones and the specific nuclei where they are produced ADH containing fibers and accumulation of ADH in the Miklós Palkovits posterior pituitary, sagittal section Palkovits M: Isolated removal of hypothalamic or other brain nuclei of the rat. Brain Res 59:449-450 (1973) Paraventricular nucleus Median eminence ADH accumulation right to the knife cut ADH immunohistochemistry, rat hypothalamus demonstrates the direction of the transport coronal section Hypothalamic nuclei and areas Anterior region n. anterior n. preopticus med. and lat. • n. paraventricularis n. supraopticus n. suprachiasmaticus Medial region • Periventricular zone Medial zone n. ventro- and dorsomedialis • n. infundibularis (arcuatus) Lateral zone dorsolateral hypothalamic area medial forebrain bundle Posterior region n. hypothalamicus posterior corpus mamillare contributes to the HTH system Neurosecretory cells are the magno- and parvocellular neurons in the hypothalamus The pituitary is connected with the hypothalamus via the infundibulum Blood supply: Superior hypophyseal artery –
    [Show full text]