Rectum develops from
Human embryology Tenth edition Inderbir Singh Page no 180 The most caudal pa of the hindgut is cloaca it is paitioned to form primitive rectum and primitive urogenital sinus upper pa of rectum that is pa above the middle fold of rectum,develops from endoderm of hindgut. lower pa of rectum that is pa below the middle fold of rectum,develops from dorsal pa of cloaca (devoid of peritoneum)
Cloaca
Hind gut
Allantoic remnants
Urogeital sinus
General anatomy