Paper - A human embryo with head-process and commencing arch enteric canal
Embryology - 23 Apr 2024    Expand to Translate
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Thompson, P., and Brash, J. C. 1923. A human embryo with head-process and commencing arch enteric canal. J. Anat., 58, 1-20. PMID 17103992
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A Human Embryo with Head-Process and Commencing Archenteric Canal
By The Late Pnornsson PETER THOMPSON, M.D.,
University of Birmingham ,' Fellow of King’s College, Londan,
AND JAMES C. BRASH, M.A., M.D., B.Sc.,
Professor of Anatomy, University of Birmingham.
Towards the end of the third or beginning of the fourth week, and immediately preceding the formation of the neural groove, the human embryo passes through a phase of development characterised by the presence of certain axial structures, viz. the primitive streak, a head -process canalised by a rudimentary archenteric canal, and the protochordal plate. Even to—day but few examples of this stage are on record, and Grosser, who has published an interesting account of a young human ovum which showed these structures with great clearness, claims that previous to l913—the date of his own pub1ication—a similar stage of development in man had not previously been recorded. In 1918 Ingalls published an account of a human embryo, somewhat less advanced in develop- ment, but strikingly like the preceding in all the essentials. A third example was recorded by Strahl in 1916, but up to the present“ the publication does not appear to have reached this country. Ingalls refers to it very briefly, and states that it shows a very similar stage of development, and adds that no data are given as to the age of the specimen.
The present paper is a further contribution to the subject, and, as far as can be ascertained, these four specimens comprise the material which illustrates a phase of development in the human embryo which falls somewhere between that represented by the ova of Fetzer, Von Herff and Beneke on the one hand, and that represented by the ova of Frassi and Eternod and Graf Spee’s Gle on the other. Estimating the age from the stage of development, Grosser gives 18 days, which is perhaps not far out. This archenteric stage, if such a term may be used for convenience, appears to be quite a transient one, and this may account for the small number of specimens which up to the present have been described.
The stage appears to correspond very closely with that which Wilson and Hill have described in their well-known work on monotreme development as the “post-gastrular stage.” They point out that this stage “includes the de-
1 The clinical history of this embryo was detailed by the late Professor Thompson in his Ingleby Lecture before the University of Birmingham, in October, 1918. The first part of this paper, including the “General description of the Ovum,” he left in MS., and it represents all that he was able to complete for publication before his lamented death.—J. C. B.
2 This was written in l920.—J. C. B.
Cite this page: Hill, M.A. (2024, April 23) Embryology Paper - A human embryo with head-process and commencing arch enteric canal. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Paper_-_A_human_embryo_with_head-process_and_commencing_arch_enteric_canal
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G
