File:Florian1930-text-fig01.jpg

Text-fig 8. Schemes of the chief stages in the development of the human embryo

(text-fig. 1) corresponds with the Peters embryo (1899; Grosser, 1913): the primitive streak primordium and the stalk are not yet present; the embryo is situated in a thickening of the chorionic mesoderm. The future limits of the stalk are designated by a ʘ and a *. The axis of that part of the chorionic mesoderm, which will be transformed into the stalk in the course of further development, is marked by an arrow: it is perpendicular to the middle of the embryonal plate. During the further development, the amniotic cavity and the yolk-sac enlarge so rapidly that the mesoderm covering them is not able to keep pace. Whilst in stage 1 (text-fig. 1) the mesoderm of the amnion and that covering the dorsal marginal part of the yolk-sac are similar in structure to the chorionic mesoderm,

Ectoderm black; entoderm lined horizontally, primitive streak vertically, head process and chorda plate obliquely. Mesoderm dotted. The axis of the connecting stalk is marked by an arrow. The limits of the connecting stalk are marked by * and ʘ, the limits of the umbilical stalk by + and ʘ). The direction of the extension of the amniotic cavity towards the connecting stalk is marked by arrows. The parts of the allantois and of the axis of the connecting stalk situated out of the median plane are finely dotted. A. Connecting stalk; B. umbilical stalk; Cl.m. cloacal membrane.

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Links: Text-fig 1 | Text-fig 2 | Text-fig 3 | Text-fig 4 | Text-fig 5 | Text-fig 6 | Text-fig 7 | Text-fig 1-7 | Text-fig 8 | Text-fig 9 | Text-fig 8-9 | Florian 1930 | Historic Embryology Papers

Reference

Florian J. The formation of the connecting stalk and the extension of the amniotic cavity towards the tissue of the connecting stalk in young human embryos. (1930) J. Anat., 64: 454-476.

Cite this page: Hill, M.A. (2024, April 27) Embryology Florian1930-text-fig01.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Florian1930-text-fig01.jpg

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