Body-stalk
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| Body-stalk | ||
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| Diagram showing the expansion of amnion and delimitation of the umbilicus. | ||
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| Section through the embryo. | ||
| Gray's | subject #10 53 | |
| Dorlands/Elsevier | s_21/12755040 | |
The caudal end of the embryo is at first connected to the chorion by a band of mesoderm called the body-stalk, but with the formation of the caudal fold the body-stalk assumes a ventral position; a diverticulum of the yolk-sac extends into the tail fold and is termed the hind-gut.
The function of the body-stalk is later replaced by the umbilical cord.
[edit] Additional images
 Human embryo—length, 2 mm. Dorsal view, with the amnion laid open. X 30. |
 Human embryo of 2.6 mm. |
 Diagram showing later stage of allantoic development with commencing constriction of the yolk-sac. |
 Model of human embryo 1.3 mm. long. |
 Section through ovum imbedded in the uterine decidua. |
 Embryo between eighteen and twenty-one days. |
 Human embryo about fifteen days old. Brain and heart represented from right side. Digestive tube and yolk sac in median section. |
[edit] External links
- Swiss embryology (from UL, UB, and UF) hdisqueembry/triderm0
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