Paper - The prechordal plate in a human embryo with small neuropore
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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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The Prechordal Plate in a Human Embryo with Small Neuropore
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. (2021, April 20) 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
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