DOCSLIB.ORG

The Development of the Head-Muscles in Gallus Domesticus, and the Morphology of the Head-Muscles in the Sauropsida

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
The Development of the Head-Muscles in Gallus Domesticus, and the Morphology of the Head-Muscles in the Sauropsida HEAD-MUSCLES IN GALLUS AND OTHER SA.UROPS1DA. 511 The Development of the Head-muscles in Gallus domesticus, and the Morphology of the Head-muscles in the Sauropsida. F. H. Edgeworth, IU.IJ., D.Sc, Professor of Medicine, University College, Bristol (from the Anatomical Laboratory). With 39 Text-figures. A FEW papers have been published on the early stages of development of the head-muscles of Gallus and other birds, and on the insertion of the mandibular muscles into Meckel's cartilage and the lower jaw; but as yet there has been no description of the formation of all the muscles in any one bird which might serve as a basis for a discussion of their morpho- logy. The following is a contribution to the subject founded on an investigation of Gallus. I found it was impossible to understand these head-muscles without comparing them with those of Reptiles, but the diffi- culty of doing so was accentuated by the almost complete absence of knowledge of their development; for although Corning has described the early stages in Lacerta, the later ones are not known, and no other Reptiles have been investi- gated. Several friends, however, were good enough to lend me sections or embryos of the later stages of Chelone, Alliga- tor, Sphenodon, Agatna, and Chama^leon, and I was able to procure those of Tropidonotus natris, so that it was possible to follow the growth and changes in the muscles which take place and give each group its special charac- teristics. VOL. 5], PAET 4.—NEW SERIES. 39 512 F. H. EDGEWOBTH. The treatises of Gadow and Hoffman have been taken as guides for the adult anatomy of the head-muscles of the Sauropsida. Some changes in the nomenclature have been made in an attempt to apply identical names to homologous muscles, for examination of their development shows that different names have been given to homologous muscles,1 and the same name to muscles of different origins and morpho- logy.8 A list of the terms employed is given in an appendix. VISCERAL CARTIT-AG.ES. The development of the visceral cartilages in the various groups of the Sauropsida has already been described by TEXT-FIG. 1.—Transverse section through embryo of Gallus, with 11 trunk somites. (For explanation of lettering see p. 555.) Parker, Howes and Swinnerton, and by Broom ; and I have very little to add. An interesting point is, that in early stages of Tropidonotus there is a long pterygoid process pro- jecting forwards from the upper end of the quadrate (text-fig. 37, p. 543). By the time chondrification has taken place this pterygoid process has atrophied; and there is only its proximal 1 E.g. the anterior part of the ventral longitudinal muscles has been called " cerato-mandibularis" (Sphenodon and Lacertilia vera), " genio- hyoid" (Chelonia and Rhiptoglossa), " maxillo-hyoideus" (Ophidia), and " anterior belly of inaxillo-coracoideus " (Crocodilia). a E. g. the name " eerato-hyoideus " has been given to a muscle developed from the first branchial myotome of Sphenodon and Lacertilia vera, to the hyoglossus in Crocodilia and Rhiptoglossa, and to a muscle developed from the posterior mylohyoid in Birds. HBAD-MCJSOLBS IN GALLUS AND OTHER SAUROPSIDA. 513 end left—as a stump, which Parker (who, however, did not see the earlier stage) erroneously homologised with the " pedicle " in the frog. TEXT-FIG. 2.—Coronal section through embryo of Gallus, with 14 trunk somites ; outside the dorsal aorta, on either side, is seen the upper lateral part of the pharynx (cp. text-fig. 3), and outside this the upper part of the dorsal cephalic ccelom, which is con- tinuous behind with the first trunk somite. (For explanation of lettering see p. 555.) In all the Sauropsida, consequently, there is a long ptery- goid process to the quadrate in early stages of development. ftypobf. spf mes TEXT-FIG. 3.—Transverse section through embryo of Gallus, with 18 trunk somites. (For explanation of lettering see p. 555.) In Sphenodon, Lacertilia vera, Rhiptoglossa, and Croco- dilia this pterygoid process has a processus ascendens, or epi- pterygoid, which is developed very early in Sphenodon (vide Howes and Swinnerton), late in the Alligator (text-fig. 22, p. 527). 514 F. E. EDGEWOBTH. There are three median hyobranchial cartilages in Grallus. Parker called them the cartilago entoglossa, basihyal, and tbrmy TBXT-FIG. 4.—Sagittal section through embryo of Gallus, with 2 fully formed and 1 partially formed gill-pouch. (For explana- tion of lettering see p. 555.) urohyal, and stated that the first named was formed by lateral fusion of the lower ends of the ceratohyals. Geoffrey Smith TEXT-FIG. 5.—Sagittal section through embryo of Gallus, with 3 gill-pouches. From the anterior portion of the gut a hollow pouch projects laterally, the wall of which is cut by this section (the Anlage of the premandibular segment), (For explanation of lettering see p. 555.) HEAD-MUSCLES IN GALLTJS AND OTHER SAUROPSIDA. 515 subsequently stated that in a five-day-old chick each cerato- hyal is continuous below with a " branchial blastema." Transverse sections show that whereas the lower ends of premandsegan TEXT-FIG. 6.—Transverse section through an embryo of Galhis, showing fully formed Anlage of pi-emandibular segment. (For explanation of lettering see p. 555.) the first branchial bars meet each other in the middle line, the lower ends of the ceratohyals are separated from one another TEXT-FIG. 7.—Transverse section through an embryo of Gallus, with 3 fully formed gill-pouches, in hyoid and first branchial seg- ments. (For explanation of lettering see p. 555.) by a median procartilaginous structure (text-fig. 12, p. 519), which is continuous with a median structure in front and behind. Chondrification takes place, the middle portion of 516 P. H. EDGEWOB.TH. the ceratohyal disappears,1 and the lower end forms a short cornu to the cart, entoglossa, which is, therefore, a median basihyal or glossohyal with ceratohyal cornua. The middle piece (Copula i, of Gaupp) is a first basibranchial, and the urohyal (Copula ii) a second basibranchial.1 This conclusion is supported by comparison with the condi- tions found in Reptiles. In Sphenodon, Lacertilia vera, Ehiptoglossa, Chelonia, and Crocodilia there is a continuous basihyobranchial cartilage, and in the first four groups there are ceratohyal cornua homologous with those in Gallus. In TEXT-FIG. 8.—Sagittal section through an einhryo of Gallus, with 4 gill-pouches. (For explanation of lettering see p. 555.) Sphenodon these ceratohyal cornua are formed by ceratolij'al bars which are continuous above with the hyomandibulars, in Agama, Chamasleon, and Chelone they are the lower ends of ceratohyal bars which, in embryonic stages, were continuous with the hyomandibulars. In the Crocodilia there are no ceratohyal cornua to the basihyobranchial, and the single 1 The small bit of cartilage which is described by Geoffrey Smith as separating from the lower end of the infrastapedial on the eighth day is probably homologous with that called "stylohyal" by Parker in Uhelidon urbica. HEAD-MUSCLES IN GALLUS AND OTHER SAUROPSIDA. 517 embryo I had was too far advanced in development (chondri- fication was complete) for one to see this stage—of a cerato- hyal continuous from the hyomandibular above to the basi- hyobranchial below. A first branchial bar is present in all groups of the Saurop- sida, a second branchial in Chelonia1 (vide text-fig. 19, p. 525), Sphenodon, and Lacertilia vera, but is absent in Birds, Croco- dilia, Bhiptoglossa, and Ophidia. The main differences, consequently, between Birds and TEXT-FIG. 9.—Sagittal section through an embryo of Gallus, with 4 gill-pouches. It shows (partially) the formation of the ventral longitudinal muscles, which originate from the first (half) royo- torne and the four succeeding ones. Owing to the spiral twist of the embryo no single section shows all the five downgvowths. (For explanation of lettering see p. 555.) Reptiles in the state of the hyobranchial skeleton, are that in the former a second basibranchial is developed2 and the median cartilages become jointed. There are correlated 1 The suggestions of Gaupp in regard to the nature of the cart, entoglossa in Birds and the existence of a second branchial bar in Chelone are thus confirmed. 2 It is absent in some few Birds, e. g. Rhea, Platalea. 518 1<\ H. EDGEWOK.TH. differences in certain muscles of the head which will be described later on. Parker, who did not investigate any embryonic stages, R.SUfl TEXT-FIGS. 10 AND 11.—Sagittal sections through an embryo ot Gallus at the end of the fifth day. 10 is the more external. (For explanation of lettering see p. 555.) described the columella of the adult Ohamfeleon as consisting of stapedial, mediostapedial, extrastapedial, and supra- HEAD-MUSCLES IN GALLUS AND OTHER SAUROPS1DA. 519 stapedial portions, the extra- and supra-stapedial portions lying internal to the quadrate. Study of the development, however, shows that his " extrastapedial" is the persisting upper end of the ceratohyal which lies at first posterior to the quadrate (text-figs. 32 and 33, p. 536) in the hyoid segment. A true extrastapedial is absent. The hyoid bar of Tropidonotus similarly lies at first in the hyoid segment (text-fig. 37, p. 543). The " tuberculuni " (of Parker) attached to it is probably a suprastapedial element; it is developed as an outwards and upwards projecting process of TEXT-FIG. 12.—Transverse section through an embryo of Gallus at the beginning of the sixth day. (For explanation of lettering see p. 555.) the hyoid bar (at a stage later than that shown in text-fig. 37, p. 543), and only subsequently rotates forward. Parker stated that the "tuberculum" became adherent to the stapedial plate, but so far as my observations go it simply disappears.
Load more

Recommended publications
  • Questions on Human Anatomy
    Standard Medical Text-books. ROBERTS’ PRACTICE OF MEDICINE. The Theory and Practice of Medicine. By Frederick T. Roberts, m.d. Third edi- tion. Octavo. Price, cloth, $6.00; leather, $7.00 Recommended at University of Pennsylvania. Long Island College Hospital, Yale and Harvard Colleges, Bishop’s College, Montreal; Uni- versity of Michigan, and over twenty other medical schools. MEIGS & PEPPER ON CHILDREN. A Practical Treatise on Diseases of Children. By J. Forsyth Meigs, m.d., and William Pepper, m.d. 7th edition. 8vo. Price, cloth, $6.00; leather, $7.00 Recommended at thirty-five of the principal medical colleges in the United States, including Bellevue Hospital, New York, University of Pennsylvania, and Long Island College Hospital. BIDDLE’S MATERIA MEDICA. Materia Medica, for the Use of Students and Physicians. By the late Prof. John B Biddle, m.d., Professor of Materia Medica in Jefferson Medical College, Phila- delphia. The Eighth edition. Octavo. Price, cloth, $4.00 Recommended in colleges in all parts of the UnitedStates. BYFORD ON WOMEN. The Diseases and Accidents Incident to Women. By Wm. H. Byford, m.d., Professor of Obstetrics and Diseases of Women and Children in the Chicago Medical College. Third edition, revised. 164 illus. Price, cloth, $5.00; leather, $6.00 “ Being particularly of use where questions of etiology and general treatment are concerned.”—American Journal of Obstetrics. CAZEAUX’S GREAT WORK ON OBSTETRICS. A practical Text-book on Midwifery. The most complete book now before the profession. Sixth edition, illus. Price, cloth, $6.00 ; leather, $7.00 Recommended at nearly fifty medical schools in the United States.
    [Show full text]
  • MRI-Based Assessment of Masticatory Muscle Changes in TMD Patients After Whiplash Injury
    Journal of Clinical Medicine Article MRI-Based Assessment of Masticatory Muscle Changes in TMD Patients after Whiplash Injury Yeon-Hee Lee 1,* , Kyung Mi Lee 2 and Q-Schick Auh 1 1 Department of Orofacial Pain and Oral Medicine, Kyung Hee University Dental Hospital, #613 Hoegi-dong, Dongdaemun-gu, Seoul 02447, Korea; [email protected] 2 Department of Radiology, Kyung Hee University College of Medicine, Kyung Hee University Hospital, #26 Kyunghee-daero, Dongdaemun-gu, Seoul 02447, Korea; [email protected] * Correspondence: [email protected]; Tel.: +82-2-958-9409; Fax: +82-2-968-0588 Abstract: Objective: to investigate the change in volume and signal in the masticatory muscles and temporomandibular joint (TMJ) of patients with temporomandibular disorder (TMD) after whiplash injury, based on magnetic resonance imaging (MRI), and to correlate them with other clinical parameters. Methods: ninety patients (64 women, 26 men; mean age: 39.36 ± 15.40 years), including 45 patients with symptoms of TMD after whiplash injury (wTMD), and 45 age- and sex- matched controls with TMD due to idiopathic causes (iTMD) were included. TMD was diagnosed using the study diagnostic criteria for TMD Axis I, and MRI findings of the TMJ and masticatory muscles were investigated. To evaluate the severity of TMD pain and muscle tenderness, we used a visual analog scale (VAS), palpation index (PI), and neck PI. Results: TMD indexes, including VAS, PI, and neck PI were significantly higher in the wTMD group. In the wTMD group, muscle tenderness was highest in the masseter muscle (71.1%), and muscle tenderness in the temporalis (60.0%), lateral pterygoid muscle (LPM) (22.2%), and medial pterygoid muscle (15.6%) was significantly more frequent than that in the iTMD group (all p < 0.05).
    [Show full text]
  • Imaging of Mandibular Fractures: a Pictorial Review
    Nardi et al. Insights into Imaging (2020) 11:30 https://doi.org/10.1186/s13244-020-0837-0 Insights into Imaging EDUCATIONAL REVIEW Open Access Imaging of mandibular fractures: a pictorial review Cosimo Nardi1, Chiara Vignoli1, Michele Pietragalla1, Paolina Tonelli1, Linda Calistri1, Lorenzo Franchi2,3, Lorenzo Preda4,5* and Stefano Colagrande1 Abstract Mandibular fractures are among the most common maxillofacial fractures observed in emergency rooms and are mainly caused by road accidents. The clinical features of mandibular fractures include malocclusion and loss of mandibular function. Panoramic radiography is usually limited to isolated lesions, whereas computed tomography is the tool of choice for all other facial traumatic events. No reference standard classification system for the different types of mandibular fractures is defined. Therapeutic options include a conservative approach or surgical treatment based on the anatomic area and the severity of fracture. The main purpose of this pictorial review is to illustrate a practical description of the pathophysiology of mandibular fractures and describe both the imaging techniques to recognise them and the therapeutic indications. Keywords: Mandible, Condyle, Fracture, Trauma, Panoramic radiography Key points maxillofacial fractures varies according to geographical Mandibular fractures represent two thirds of all areas and socio-economic factors. The most common maxillofacial fractures. causes of maxillofacial fractures are road traffic accidents X-ray films, including panoramic radiography, are (40–42%), falls, assaults, sports, and work injuries [3]. usually limited to mild traumatic events. The average age of patients with mandibular fracture is Computed tomography is the tool of choice for the 38 years for men and 40 years for women [4].
    [Show full text]
  • Computed Tomography of the Buccomasseteric Region: 1
    605 Computed Tomography of the Buccomasseteric Region: 1. Anatomy Ira F. Braun 1 The differential diagnosis to consider in a patient presenting with a buccomasseteric James C. Hoffman, Jr. 1 region mass is rather lengthy. Precise preoperative localization of the mass and a determination of its extent and, it is hoped, histology will provide a most useful guide to the head and neck surgeon operating in this anatomically complex region. Part 1 of this article describes the computed tomographic anatomy of this region, while part 2 discusses pathologic changes. The clinical value of computed tomography as an imaging method for this region is emphasized. The differential diagnosis to consider in a patient with a mass in the buccomas­ seteric region, which may either be developmental, inflammatory, or neoplastic, comprises a rather lengthy list. The anatomic complexity of this region, defined arbitrarily by the soft tissue and bony structures including and surrounding the masseter muscle, excluding the parotid gland, makes the accurate anatomic diagnosis of masses in this region imperative if severe functional and cosmetic defects or even death are to be avoided during treatment. An initial crucial clinical pathoanatomic distinction is to classify the mass as extra- or intraparotid. Batsakis [1] recommends that every mass localized to the cheek region be considered a parotid tumor until proven otherwise. Precise clinical localization, however, is often exceedingly difficult. Obviously, further diagnosis and subsequent therapy is greatly facilitated once this differentiation is made. Computed tomography (CT), with its superior spatial and contrast resolution, has been shown to be an effective imaging method for the evaluation of disorders of the head and neck.
    [Show full text]
  • Atlas of the Facial Nerve and Related Structures
    Rhoton Yoshioka Atlas of the Facial Nerve Unique Atlas Opens Window and Related Structures Into Facial Nerve Anatomy… Atlas of the Facial Nerve and Related Structures and Related Nerve Facial of the Atlas “His meticulous methods of anatomical dissection and microsurgical techniques helped transform the primitive specialty of neurosurgery into the magnificent surgical discipline that it is today.”— Nobutaka Yoshioka American Association of Neurological Surgeons. Albert L. Rhoton, Jr. Nobutaka Yoshioka, MD, PhD and Albert L. Rhoton, Jr., MD have created an anatomical atlas of astounding precision. An unparalleled teaching tool, this atlas opens a unique window into the anatomical intricacies of complex facial nerves and related structures. An internationally renowned author, educator, brain anatomist, and neurosurgeon, Dr. Rhoton is regarded by colleagues as one of the fathers of modern microscopic neurosurgery. Dr. Yoshioka, an esteemed craniofacial reconstructive surgeon in Japan, mastered this precise dissection technique while undertaking a fellowship at Dr. Rhoton’s microanatomy lab, writing in the preface that within such precision images lies potential for surgical innovation. Special Features • Exquisite color photographs, prepared from carefully dissected latex injected cadavers, reveal anatomy layer by layer with remarkable detail and clarity • An added highlight, 3-D versions of these extraordinary images, are available online in the Thieme MediaCenter • Major sections include intracranial region and skull, upper facial and midfacial region, and lower facial and posterolateral neck region Organized by region, each layered dissection elucidates specific nerves and structures with pinpoint accuracy, providing the clinician with in-depth anatomical insights. Precise clinical explanations accompany each photograph. In tandem, the images and text provide an excellent foundation for understanding the nerves and structures impacted by neurosurgical-related pathologies as well as other conditions and injuries.
    [Show full text]
  • Of the One-Humped Camel
    J. Anat. (1970), 106, 2, pp. 341-348 341 With 3 figures Printed in Great Britain The course and branches of the facial nerve of the one-humped camel I. ARNAUTOVIC, M. E. ABU SINEINA AND M. STANIC Faculty of Veterinary Science, University of Khartoum (Received 14 February 1969) The course and ramification of the facial nerve of the camel have not previously been clearly established, and the brief references that occur in the literature are of a rather general kind. Thus Lesbre (1906) stated that the cranial nerves of the camel were similar to those of ruminants, and Leese (1927) concluded that there were no significant differences between the course of the facial nerve of the camel and that of other ruminants. Droandi (1936) gave a more detailed account of the facial nerve which he described as ramifying on the external surface of the head. Tayeb (1958), who studied the cranial nerves of the camel, did not give the full account of the facial nerve. MATERIAL AND METHODS During the period July 1966 to December 1967 the heads of fifteen camels slaugh- tered at Tamboul Slaughterhouse, south-east of Khartoum, were collected for dis- section at the Faculty of Veterinary Science, Shambat. The heads belonged to normal healthy animals, seven males and eight females, varying in age from 4 to 10 years. Both sides of each head were used in the study. The heads were removed, with their skin intact, from the carcasses at the level of the third cervical vertebra. Some of the specimens were dissected immediately after collection, others were injected with 10 % formalin and studied later.
    [Show full text]
  • A Comparative Electromyographic Analysis of Masseter and Temporalis Muscles in Edentulous Subjects
    Jemds.com Original Research Article A Comparative Electromyographic Analysis of Masseter and Temporalis Muscles in Edentulous Subjects Krishna Prasad D.1, Annis Thomas2, Chethan Hegde3 1Department of Prosthodontics, Crown and Bridge, AB Shetty Memorial Institute of Dental Sciences, NITTE University, Mangaluru, Karnataka, India. 2Department of Prosthodontics, Crown and Bridge, AB Shetty Memorial Institute of Dental Sciences, NITTE University, Mangaluru, Karnataka, India. 3Department of Prosthodontics, Crown and Bridge, AB Shetty Memorial Institute of Dental Sciences, NITTE University, Mangaluru, Karnataka, India. ABSTRACT BACKGROUND All parts of skeletal system are held together and moved by skeletal muscles, which Corresponding Author: provide for locomotion for the individual to survive. Four pairs of muscles make a Annis Thomas, Postgraduate Student, group of muscles of mastication: temporalis, masseter, medial and lateral pterygoid. AB Shetty Memorial Institute of Dental Masseter is a rectangular muscle originating from the zygomatic arch extending Sciences, NITTE University, Mangaluru, downwards to lateral aspect of lower border of ramus. We wanted to evaluate the Karnataka, India. activity of masseter and temporalis muscle using electromyogram in subjects with E-mail: [email protected] balanced and non-balanced occlusion complete dentures. DOI: 10.14260/jemds/2019/799 METHODS 38 participants were selected and grouped into two as balanced and non-balanced Financial or Other Competing Interests: None. occlusal denture subjects. Steps of fabricating a complete denture was followed along by addition of tracing in cases of balanced occlusion group. This was followed How to Cite This Article: by recording the electromyographic readings at 1st appointment followed by an Prasad KD, Thomas A, Hegde C. A interval of 1 week and 3 weeks.
    [Show full text]
  • The Independent Functions of the Two Heads of the Lateral Pterygoid Muscle
    The Independent Functions of the Two Heads of the Lateral Pterygoid Muscle JAMES A. McNAMARA, JR. Department of Anatomy and Center for Human Growth and Development, The University of Michigan, Ann Arbor, Michigan 48104 ABSTRACT Investigations on the role of the lateral pterygoid muscle in mandibular movements have been limited due to difficulties in obtaining con- sistent neuromuscular recordings in human subjects. The rhesus monkey was used as a substitute experimental animal. Thirty-three Macaca mulatta were monitored in 113 electromyographic recording sessions. Two distinct functional patterns were identified from the region of the lateral pterygoid muscle, depend- ing upon the location of the electrodes within this muscle. Through anatomical dissection of areas of electrode placement in 12 animals, the two patterns of activity were related to the inferior and superior heads of the lateral pterygoid muscle. The inferior head acted synergistically with the suprahyoid muscle group in opening movements of the mandible. No activity was noted in closing movements, or in swallowing. In contrast, the superior head was not active dur- ing opening movements. Electromyographic activity of the superior head, an- tagonistic to the suprahyoid muscles, was observed during such closing move- ments as chewing and clenching of the teeth and during deglutition. The superior head presumably positioned or stabilized the condylar head and disc against the articular eminence during closing movements of the mandible, while the in- ferior head assisted in the translation of the condylar head downward, anteriorly, and contralaterally during opening movements. Thus, the two heads of the lateral pterygoid can be considered as two functionally distinct muscles.
    [Show full text]
  • AR 31-14 Wong STYLOID AB
    1 Temporal headaches and associated symptoms relating to the styloid process and its attachments Annals Academy of Medicine, Singapore January 1995; Vol. 24; No. 1; pp. 124-128 E. Wong, DDS; G Lee, MD; DT Mason, MD KEY POINTS FROM THIS ARTICLE: 1) The styloid process is a thin “spike-like bony process” that is attached to the base of the skull. 2) 5 structures (3 muscles and 2 ligaments) are attached to the styloid process: A)) The styloglossus muscle B)) The stylohyoid muscle C)) The stylopharyngeal muscle D)) The stylomandibular ligament E)) The stylohyoid ligament 3) Trauma (auto accidents, falls, sports injuries, prolonged or excessive mouth opening) can detach any of these 5 structures from the periosteum of the styloid bone. 4) “The detachment of Sharpey's fibers results in the release of noxious chemicals such as kinins, histamines, prostaglandins, etc., which can produce a withdrawal reflex, causing muscle tension, ischaemia, spasm and pain.” 5) Pain transmission from “C” pain fibers induces a host of autonomic responses. [Key Point] 6) These authors have identified 11 common pains and symptoms associated with soft tissue lesions of the styloid process and stylomandibular ligament: A)) Headaches localized in the anterior temporal fossa. This is due to the pain withdrawal reflex and spasm of temporalis muscle fibers. B)) Sore throat and difficulty swallowing in the absence of inflammation. This is due to the pain withdrawal reflex and spasm of all three of the styloid-attached muscles. C)) Pain radiating to the temporomandibular joint and ear. This is due to the pain withdrawal reflex and spasm of the muscles of mastication, particularly the masseter and the medial/lateral pterygoids.
    [Show full text]
  • Jaw Muscularization Requires Dlx Expression by Cranial Neural Crest Cells
    Jaw muscularization requires Dlx expression by cranial neural crest cells Églantine Heudea, Kamal Bouhalia, Yukiko Kuriharab, Hiroki Kuriharab, Gérard Coulya, Philippe Janvierc,d, and Giovanni Levia,1 aÉvolution des Régulations Endocriniennes, Centre National de la Recherche Scientifique Unité Mixte de Recherche 7221, Muséum National d’Histoire Naturelle, 75005 Paris, France; bDepartment of Physiological Chemistry and Metabolism, Graduate School of Medicine, University of Tokyo,113-0033 Tokyo, Japan; cDépartement Histoire de la Terre, Centre National de la Recherche Scientifique Unité Mixte de Recherche 7207, Muséum National d’Histoire Naturelle, 75005 Paris, France; and dThe Natural History Museum, London SW7 5BD, United Kingdom Edited* by Nicole M. Le Douarin, Centre National de la Recherche Scientifique, Gif-sur-Yvette, France, and approved May 14, 2010 (received for review February 11, 2010) The origin of active predation in vertebrates is associated with the trunk muscles depends on different regulatory pathways (13–16). rise of three major, uniquely derived developmental characteristics In the head, bone morphogenetic proteins (BMPs) and canonical of the head: (i) migratory cranial neural crest cells (CNCCs) giving Wnt signaling molecules act to repress skeletal muscle differen- rise to most skeletal skull elements; (ii) expression of Dlx genes by tiation. By contrast, the same BMP and Wnt ligands are required CNCCs in the Hox-free first pharyngeal arch (PA1); and (iii) muscu- to stimulate myogenesis in the trunk. Myogenic differentiation of larization of PA1 derivatives. Here we show that these three inno- the CPM in vitro is permitted, therefore, by CNCC production of vations are tightly linked. Expression of Dlx genes by CNCCs is not BMP and Wnt inhibitors (Noggin, Gremlin, Frzb) (17).
    [Show full text]
  • Topographic Anatomy of the Head
    O. V. Korencov, G. F. Tkach TOPOGRAPHIC ANATOMY OF THE HEAD Study guide Ministry of Education and Science of Ukraine Ministry of Health of Ukraine Sumy State University O. V. Korencov, G. F. Tkach TOPOGRAPHIC ANATOMY OF THE HEAD Study guide Recommended by Academic Council of Sumy State University Sumy Sumy State University 2016 УДК 611.91(075.3) ББК 54.54я73 K66 Reviewers: L. V. Phomina – Doctor of Medical Sciences, Professor of Vinnytsia National Medical University named after M. I. Pirogov; M. V. Pogorelov – Doctor of Medical Sciences, Professor of Sumy State University Recommended for publication by Academic Council of Sumy State University as а study guide (minutes № 5 of 11.02.2016) Korencov O. V. K66 Topographic anatomy of the head : study guide / O. V. Korencov, G. F. Tkach. – Sumy : Sumy State University, 2016. – 81 р. ISBN 978-966-657-607-4 This manual is intended for the students of medical higher educational institutions of IV accreditation level, who study Human Anatomy in the English language. Посібник рекомендований для студентів вищих медичних навчальних закладів IV рівня акредитації, які вивчають анатомію людини англійською мовою. УДК 611.91(075.3) ББК 54.54я73 © Korencov O. V., Tkach G. F., 2016 ISBN 978-966-657-607-4 © Sumy State University, 2016 TOPOGRAPHIC ANATOMY OF THE HEAD The head is subdivided into two following departments: the brain and facialohes. They are shared by line from the glabella to the supraorbital edge along the zygomatic arch to the outer ear canal. The brain part consists of fornix and base of the skull. The fornix is divided into fronto- parieto-occipital region, paired temporal and mastoid area.
    [Show full text]
  • Developmental Anomalies of Temporal Muscle
    urrent C R Guerrissi and Cotroneo, Surgery Curr Res 2014, 4:5 : es ry e e a g r r c 10.4172/2161-1076.1000199 u h DOI: S Surgery: Current Research ISSN: 2161-1076 Research Article Open Access Developmental Anomalies of Temporal Muscle Jorge Orlando Guerrissi and Gustavo Gabriel Cotroneo* Hospital cosme argerich, ciudad de buenos aires, buenos aires, Argentina *Correspondimg author: Gustavo Gabriel Cotroneo, Hospital cosme argerich plastic and reconstructive surgery, pyy margal 750, ciudad de buenos aires, buenos aires C1155AHD, Argentina, Tel: +5491132266671/ 41210900; E-mail: [email protected] Rec date: May 21, 2014; Acc date: Jul 7, 2014; Pub date: Jul 9, 2014 Copyright: © 2014 Guerrissi JO, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Abstract The anatomy of the temporal region is complex. Also there is controversy over the structures that make up the region. Thus than classically described anatomical structures as fascias, temporal muscle, frontal nerve, arteries, the superficial temporal muscle is present in a variable number of cases. This muscle represents fibrous regression of named superficial temporal muscle very developed in animals with a specific masticatory action. In human has no physiological importance but its knowledge is important for plastic and maxillofacial surgeons to undertake surgeries in the region since it can generate confusion over anatomical planes and their relationship to vessels and nerves. Keywords: Developmental anomalies; Superficial temporal muscle; A loose areolar tissue plane lies deep to the temporoparietal fascia Temporoparietal fascia; Temporal region and extends beneath the entire superficial fascia system of the scalp, including the galea aponeurotica and the frontalis and occipitalis Introduction muscle.
    [Show full text]