9- Embroyology Of The Foregut

Question 1

When does gut begin to form

Answer 1

Day 30

Question 2

How is the gut tube formed

Answer 2

. The gut tube is formed from two layers of germ line tissue, the endoderm and the mesoderm.
. The endoderm (inner layer) develops into the mucosal epithelium, mucosal glands and the submucosal glands,
the mesoderm becomes the lamina propria, gut smooth muscle, blood vessels and the serosa. The submucosal and myenteric plexus arise separately from the neural crest.”

Question 3

What happens day 35-39

Answer 3

Duodenum differentiated from stomach

Pancreas starts developing from ventral and dorsal pancreatic buds

Question 4

What happens day 40-55

Answer 4

Liver begins to take shape
Duodenum twists to move ventral and dorsal pancreas closer together
Gall bladder and biliary ducts distinguishable

Question 5

What happens day 56

Answer 5

Dorsal and ventral pancreas fuse

Dorsal pancreatic duct fuses with cystic duct and ventral pancreatic duct becomes route of drainage into SI