Embryology - 3 Dec 2023 Expand to Translate
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Atwell WJ. The prechordal plate in a human embryo with small neuropore. (1926) Anat. Rec. 32(3):200.

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This historic 1926 paper by Atwell described development of the prechordal plate in a human embryo with small neuropore. The author identifies this embryo by comparison with other embryos as a Carnegie stage 11

See also by this author Atwell WJ. The development of the hypophysis cerebri in man, with special reference to the pars tuberalis. (1926) Amer. J Anat. 37: 139-193.

Carnegie Collection

Carnegie Collection - Stage 11
Serial No.	Pairs of somites	Size (mm)	Grade	Fixative	Embedding Medium	Plane	Thinness (µm)	Stain	Year	Notes
470	17	E, 4.3 Ch, 16	Good	Formol	P	Transverse	10	Al. carm. .	1910

Carnegie Collection - Stage 11
Serial No.	Pairs of somites	Size (mm)	Grade	Fixative	Embedding Medium	Plane	Thinness (µm)	Stain	Year	Notes
2053	20	E, 3.1 Ch, 12	Exc.	Formol	P	Transverse	10	Al. coch.	1918	Most advanced in group. Ag added to slide 2 Monographs by Davis (1923)^[1] and Congdon (1922)^[2]
Abbreviations Size - E. is the greatest length of the embryo and Ch. is the mean diameter of the chorion. Grade - total grade of the specimen and includes both its original quality and the condition of the mounted sections. Embedding medium - paraffin (P) or a combination of celloidin and paraffin (C-P). Fixative - formalin (Formol), alcohol and formalin (Alc, formol), Bouin (Bouin solution) ? - unknown or not determined.

↑ Davis CL. Description of a human embryo having twenty paired somites. (1923) Carnegie Instn. Wash. Publ. 332, Contrib. Embryol., 15: 1-51.
↑ Congdon ED. Transformation of the aortic-arch system during the development of the human embryo. (1922) Contrib. Embryol., Carnegie Inst. Wash. Publ 277, 14:47-110.

Modern Notes

Search PubMed - prechordal plate

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Pages where the terms "Historic" (textbooks, papers, people, recommendations) appear on this site, and sections within pages where this disclaimer appears, indicate that the content and scientific understanding are specific to the time of publication. This means that while some scientific descriptions are still accurate, the terminology and interpretation of the developmental mechanisms reflect the understanding at the time of original publication and those of the preceding periods, these terms, interpretations and recommendations may not reflect our current scientific understanding. (More? Embryology History \| Historic Embryology Papers)

The Prechordal Plate in a Human Embryo with Small Neuropore

by

Wayne J. Atwell

Department of Anatomy, University of Buffalo.

Abstract of paper presented at the Forty-Second Annual Session American Association of Anatomists, Yale University, New Haven, Connecticut April 1 to 3, 1926.

The embryo (no. 52, U.B.E.C., no. 5072, Carnegie Collection) was obtained at an operation for tuba1 pregnancy. Thirteen pairs of somites are distinctly separated and four more pairs are indicated by slight constrictions. In many respects the embryo is intermediate between no. 470 of the Carnegie Collection and no. 2053, described by Davis. The neuropore is present, but very small. The pharyngeal membrane is not perforated, although changes in the epithelium indicate places at which perforation is to occur. Communication of the yolk sac with the gut is wider than the Davis embro; more so even than in no. 470. The dorsal flexure is well marked, but the curves are gentle and do not necessitate considering the bending as due to artifact. The atrial portion of the heart has not risen up dorsal to the bulbar portion. The first pair of aortic arches is complete, while the second pair is in an early stage of formation.

At the cephalic end of the notochord is a structure which is probably to be interpreted as a rudimentary prechordal plate. The lateral extensions are not so extensive as in the embryo with seven pairs of somites described by Payne. The structure bends around the cephalic end of the foregut and for a large part of its length is free of attachment to either ectoderm or entoderm.

Cite this page: Hill, M.A. (2023, December 3) Embryology Paper - The prechordal plate in a human embryo with small neuropore. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Paper_-_The_prechordal_plate_in_a_human_embryo_with_small_neuropore

What Links Here?

[1] Davis CL. Description of a human embryo having twenty paired somites. (1923) Carnegie Instn. Wash. Publ. 332, Contrib. Embryol., 15: 1-51.

[2] Congdon ED. Transformation of the aortic-arch system during the development of the human embryo. (1922) Contrib. Embryol., Carnegie Inst. Wash. Publ 277, 14:47-110.

[1]

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