Body-stalk

Body-stalk
	Diagram showing the expansion of amnion and delimitation of the umbilical cord
	Section through the embryo
Details
Latin	Pedunculus truncalis
Identifiers
Dorlands; /Elsevier	s_21/12755040
TA	Lua error in Module:Wikidata at line 744: attempt to index field 'wikibase' (a nil value).
TH	{{#property:P1694}}
TE	{{#property:P1693}}
FMA	{{#property:P1402}}
	Anatomical terminology [[[d:Lua error in Module:Wikidata at line 863: attempt to index field 'wikibase' (a nil value).\|edit on Wikidata]]]

The body-stalk, also known as the allantoic stalk,^[1] is a band of mesoderm that connects the caudal end of the embryo to the chorion in development. 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. With continued development, the body-stalk is later replaced by the umbilical cord.

Body stalk anomaly occurs in approximately 1 in 15,000 births.^[2] It is a result of defects in the formation of cephalic, caudal, and lateral embryonic body folds.^[3]

Additional images

Human embryo—length, 2 mm. Dorsal view, with the amnion laid open. X 30.
Gray22.png

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.
Gray977.png

Human embryo about fifteen days old. Brain and heart represented from right side. Digestive tube and yolk sac in median section.