Latin pedunculus connectans | Code TE E5.11.3.1.1.0.4 | |
The connecting stalk is a yolk sac diverticulum.
It is derived from extraembryonic mesoderm.
Progressive expansion of the amnion from the umbilical ring (surrounding the roots of the vitelline duct and connecting stalk) creates a tube of amniotic membrane. The amniotic membrane and its contents form the Umbilical cord (Larsen's Embryology, 5th edition, p138).
References
Connecting stalk Wikipedia(Text) CC BY-SA