Editing Anterior abdominal wall (section)

== '''Embryology''' ==

* The abdominal wall begins to     develop in the early stages of embryonic differentiation into ectoderm,     endoderm and mesoderm
* Mesoderm splits into     splanchnic and somatic layers, and the abdominal wall develops from the     somatic layer
* Initially this is a U-shaped     structure in the embryonic abdominal wall, which allows free communication     with the extra-embryonic coelom. It takes until the end of the third month     for this to close over (except at umbilical ring).
* Umbilical cord also develops     from mesoderm - containing the omphalomesenteric duct, allantois, and     fetal blood vessels; passing to and from the placenta. The developing gut     also protrudes through the umbilical ring (since it grows faster than can     be accommodated). However as the coelomic cavity enlarges, the intestine     returns to the peritoneal cavity.
** At birth, this closes over -      no blood through umbilical vessels, and the omphalomesenteric duct has      reduced to a fibrous cord