01 Embryology

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


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