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Unformatted text preview: Introduction Based on Innervation and Blood supply: Blood supply Innervation Foregut Coeliac trunk, splenic vein draining into hepatic portal vein Vagus nerve (PS) and greater splanchnic nerves (S) to coeliac ganglion Midgut Superior mesenteric artery and superior mesenteric vein draining into hepatic portal vein Vagus Nerve (PS) and lesser splanchnic nerves (S) Hindgut I nferior mesenteric artery and inferior mesenteric vein draining into HPV Pelvic splanchic nerves (S2, 3, 4) and S from lumbar splanchic nerves Early development Embryology of GI tract begins with folding of the embryo to create a primitive gut tube closed at cranial end by oropharyngeal membrane closed at caudal end by cloacal membrane (if improper fusion = recto-vesical fistulae) 3 germ layers give rise to all structures: endoderm: epithelium and glands of digestive tract ectoderm: outermost germ layer covering the body surface mesoderm: bone, muscle and connective tissue, splits into 2 layers...
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