TOPICS: Gut tube, midgut, cloaca, nephrogenic cord, umbilical cord, vitelline duct, yolk sac, urachus, gastrointestinal development, foregut, midgut, hindgut, umbilical ring, 90 degree counterclockwise rotation, 180 degree counterclockwise rotation, 270 degree total counterclockwise rotation, omphalomesenteric duct, superior mesenteric artery, midgut rotation in utero, gastrointestinal division, celiac trunk, esophagus, duodenum, colon, superior mesenteric artery (SMA), anal canal, pectinate line, inferior mesenteric artery (IMA), spleen, stomach, small intestines, gastrointestinal arteries