Paper - The Anatomy of Human Embryos with Seventeen to Twenty-three Pairs of Somites
Embryology - 30 Apr 2024    Expand to Translate
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Wen, I. C., The anatomy of human embryos with seventeen to twenty-three pairs of somites J. Comp. Neurol, 45, 301-376.
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The Anatomy of Human Embryos with Seventeen to Twenty-three Pairs of Somites
I Chuan Wen
Hull Laboratory of Anatomy, University of Chicago
Eight Heliotype Plates and Twelve Text Figures
Contents
Introduction
Material and methods
External form
Nervous system
Neural tube as a whole
Subdivisions of the nervous system
I. Proseneephalon
Optic vesicles
Anterior neuropore
II. Meseneephalon
III. Rhombencephalon
Rhombomeres
Neural crest
Ectodermal areas
Chorda dorsalis
Pharynx
Oral sinus and buccopharyngeal membrane
Ventral pharyngeal wall
Internal gill rudiment
Thyroid
Lung and liver
Vascular system
Nephric system
Summary
Abbreviations
Bibliography
Introduction
Many problems in early human development remain still unsolved. Studies of many more embryos from the period of somite formation will be necessary before accurate accounts of this stage of development can be written. It is important, accordingly, that every young specimen be described as fully as possible and its characteristic features be compared with those of the few similar embryos that are available for study, as well as those described in the literature. In the present paper an embryo with 17 somites (H951, Emb. Coll., Department. of Anatomy, University of Chicago) will be studied in detail and compared with embryos of 22 (H1903) and 23 (H984) somites of the same collection. The 17—somite specimen may also be compared with a 15—somite embryo of Giglio-Tos (’02), a 16-somite embryo of the Carnegie Embryological Collection (no. 470), twin embryos with 17—19 somites of Watt (’15), and the 20-somite embryo of Davis (’23). It differs, however, from all of the above mentioned in having certain features that throw light upon questions left unsettled in the others.
This work was carried on under the direction of Prof. G. W. Bartelmez. It is a pleasure to me to acknowledge my indebtedness to him for his constant aid, helpful criticism, and, above all, inspiring guidance. To Prof. R. R. Bensley and Prof. C. Judson Herrick my thanks are due for the training I received from them and for their courtesies shown to me during the course of this work. It is also a pleasure to me to express my appreciation of the courtesy of Prof. George L. Streeter for the privilege of studying the material belonging to the Carnegie Institution, Laboratory of Embryology. I have also received technical help from Miss Nixon, of Chicago, Mr. O. 0. Heard and Mr. J. F. Didusch, of Baltimore, to all of them I wish hereby to express my thanks.
Material and Methods
The embryos herein studied are listed in table 1.
Embryo H951 (fig. 1, A) was obtained from Drs. E. L. Whitney and J. T. Rocks, of Walla Walla, Washington. “The uterus was removed for fibrosis on the 13th day after the day on which menstruation was expected to begin,”
Cite this page: Hill, M.A. (2024, April 30) Embryology Paper - The Anatomy of Human Embryos with Seventeen to Twenty-three Pairs of Somites. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Paper_-_The_Anatomy_of_Human_Embryos_with_Seventeen_to_Twenty-three_Pairs_of_Somites
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G
