Development of the GI Tract

Question 1

dorsal aorta branches for foregut, midgut, hindgut

Answer 1

CSI:

foregut: Celiac trunk
midgut: Superior mesenteric artery
hindgut: Inferior mesenteric artery

Question 2

derivatives of foregut, midgut, hindgut

Answer 2

foregut: pharynx to duodenum, thyroid, lung, liver, pancreas
midgut: duodenum to proximal 2/3 of transverse colon
hindgut: distal 1/3 of transverse colon to anal canal above pectinate line

Question 3

what happens to the midgut loop during week 6? where do the cranial and caudal limbs end up?

Answer 3

herniates through the umbilicus and rotates 90 degrees counterclockwise around axis of SMA; cranial limb is on the right and caudal limb is on the left

Question 4

what happens to the midgut loop during week 10? where do the cranial and caudal limbs end up?

Answer 4

retracts into body cavity and rotates 180 degrees counterclockwise around axis of SMA; cranial limb is on the left and caudal limb is on the right

Question 5

derivatives of dorsal and ventral pancreatic buds

Answer 5

dorsal: majority of mature pancreas (body, tail, isthmus, accessory pancreatic duct
ventral: pancreatic head, main pancreatic duct, uncinate process)