Four tunic layers of GI tract
Mucosa
Submucosa
Muscularis externa
Serosa/ Adventitia
Foregut:
Midgut:
Hindgut:
Foregut: Esophagus – duodenum (2nd part)
Midgut: Duodenum to middle transverse colon
Hindgut: Distal 3rd transverse, rectum, anal canal above the dentate line