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Fig. 179. Diagrams illustrating the formation of the umbilical cord and the relations of the allantois and yolk-sac in the human embryo

From McMurrich (Development of the Human Body).

The heavy black line represents the embryonic ectoderm; the dotted line marks the line of the transition of the body (embryonic) ectoderm into that of the amnion.

Stippled areas, mesoderm. Ac, Amnionic cavity; Al, allantois; Be, exocoelom; Bs, body stalk; Ch, chorion; P, placenta; Uc, umbilical cord; V, chorionic (trophodermic) villi; Ys, yolk-sac.

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Kellicott WE. Outlines of Chordate Development (1913) Henry Holt and Co., New York.

   Outlines of Chordate Development 1913: 1. Amphioxus | 2. Early Frog | 3. Later Frog Organogeny | 4. Early Chick - Embryonic Membranes and Appendages | 5. Later Chick - Organogeny | 6. Early Mammal - Embryonic Membranes and Appendages | Figures

Cite this page: Hill, M.A. (2024, June 22) Embryology Kellicott 179.jpg. Retrieved from

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current16:53, 23 December 2013Thumbnail for version as of 16:53, 23 December 2013893 × 800 (131 KB)Z8600021 (talk | contribs)==Fig. 179. == {{Outlines of Chordate Development footer}} Category:Human