Derives the linings of many important gastrointestinal and respiratory structures:
The pharyngeal region
Divides distally into the esophagus and trachea and includes 4 key pharyngeal pouches of the head and neck.
Stomach
Proximal duodenum,
Liver buds, which ultimately form the liver,
The gallbladder,
The pancreas, which forms from the ventral and dorsal pancreatic buds (aka, diverticula).
The linings of the respiratory system (with a drawing of the trachea and lungs).
The midgut
Distal duodenum,
Jejunum,
Ileum,
Ascending colon,
Proximal 2/3 of the transverse colon.
The hindgut
Gives rise to the allantois before ending blindly at the cloaca.
Distal 1/3 of the transverse colon,
Descending and sigmoid colons, and,
The proximal 2/3 of the anorectal canal. The ectoderm gives rise to the distal 1/3 of the anorectal canal is derived from ectoderm; it invaginates the area around the proctodeum (aka, anal pit).