01 Embryology

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• amnionic cavity folds and wraps around yolk sac
• yolk sac grow into digestive track

• digestive tract surrounded by brown, endoderm
• red outside endoderm, mesoderm, CT/muscles

Mesentery

• red line mesentery
• small intestine completely wrapped in mesentery

• comes from mesoderm

• dorsal mesentery coming off back
• wall ends up covering front

• all that's left is falciform ligament, and lesser omentum between liver and stomach

• falciform outside liver and connects to wall

Foregut

Esophagus

• if septum posteriorly, cut off esophagus

Midgut

Omphalocele

• only intestine: simple

Gastroschisis

• bowel damaged

Malrotation

• cecum stretches peritoneum and create s Ladd bands

• left sided colon. Small intestine on right side. Large intestine on left side

Meckel

• cyst: vitelline duct replaced by fibrous tissue with cyst
• sinus: fibrous tissue connected to cavity behind umbilicus

Duodenal Atresia

• swelling of stomach and swelling of duodenum

Jejunal-ileal Atresia

• blind pouch and apple peeling distal

Pyloric Stenosis

• babies
• not green

Spleen

• blood supply from foregut. But arise from mesoderm

GI Innervation