File:HillFlorian1931 text-fig02.jpg

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Text-Fig. 2. Graphic reconstruction of the median section through the Dobbin embryo

Ectoderm black; endoderm lined horizontally; primitive streak lined vertically; += HENSEN’s knot; chorda-process lined obliquely; prochordal plate ( lined horizontally and dotted; mesoderm dotted; cloacal membrane (O'l.) cross—hatched. Limits of the embryonal shield marked by arrows. AL; 2: proximal (tubular) part of the allantoic canal; Al.2 = its distal (vesicular) part.

Hor. —-—=. horizontal plane (the plane of the projection in text-figs. 1 and 8). The caudal part of the embryonic formation, including the cloacal membrane, the allantoic canal, the caudal part of the amniotic cavity and the connecting stalk are projected into the median plane, and their outlines are marked by interrupted lines. , The cell-layer underneath the intermediate region and the most cranial portion of the head-process, the significance of Which is doubtful, is left White. X 75.

Anterior margin, embryonal shield to region of cloacal membrane (A-Cl.) 0.98 mm
Vertical diameter (D-F) of yolk-sac 1.092 mm
Antero-posterior diameter of yolk-sac, near its mid-region 0.98 mm
Vertical height, amnio-embryonal vesicle (D-E) 0.468 mm
Length of yolk-sac process 0.88 mm

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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)


Hill JP. and Florian J. A young human embryo (embryo dobbin) with head-process and prochordal plate. (1931) Phil. Tran. Roy. Soc. London B, 219: 443-486.

Cite this page: Hill, M.A. (2024, May 21) Embryology HillFlorian1931 text-fig02.jpg. Retrieved from

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© Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G

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