Ab Cavity 1

Question 1

cranial caudal folding

Answer 1

At approximately 4 weeks into development the embryo forms a primitive endodermal gut tube which is connected to the yolk sac via the yolk stalk or omphaloenteric duct (future umbilical cord).

Question 2

foregut stomedeum

Answer 2

(primitive mouth – ectodermal derivative) to the first 1/3rd of the duodenum; oropharyngeal membrane separates stomodeum from foregut.

arterial supply= celiac trunk

gives rise to pharyngeal pouches

Question 3

midgut

Answer 3

Last 2/3rds of duodenum to the proximal 2/3rd of the colon.

arterial supply= superior mesenteric artery

gives rise to the yolk sack

Question 4

hindgut

Answer 4

Last 1/3rd of colon to proctodeum (ectodermal derivative)

arterial supply: inferior mesenteric artery

gives rise to allantois