Hindgut - foregut Lesser Splanchnic nerves (T10-T11) MIDGUT...

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Hindgut Development of the Hindgut : ends at the cloacal membrane which separates it from the proctodaeum (endodermal) distal 1/3 of transverse colon descending colon (adheres to posterior abdominal wall) sigmoid colon (intraperitoneal) rectum (retroperitoneal) superior 2/3 the anal canal to pectinate line Congenital Abnormalities: recto-vesical fistulae – meconium (earliest stools) released from penis. imperforate anus – failure of cloacal membrane to rupture Canalisation of all intestines occur in weeks 6-8 as they initially have no lumen. Failure causes narrowing ( stenosis ) or complete obstruction ( atresia ) of the intestines Innervations: Thoracic splanchnic nerves arise from the sympathetic trunk in the thorax and provide sympathetic innervation to the abdomen divided into: Greater splanchnic nerves (T5-T9) o travels through the diaphragm and enters the abdominal cavity, contributing to the celiac plexus o modulate enteric nervous system of the
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Unformatted text preview: foregut Lesser Splanchnic nerves (T10-T11) MIDGUT o fibres synapse with the superior mesenteric plexus o modulates enteric nervous system of midgut Lumbar Splanchnic nerves (T12-L2) o innervate smooth muscle and glands of the pelvic viscera and the hindgut Enteric nervous system controlled by myenteric plexus (Auerbachs) = both parasympathetic and sympathetic. (Submucosal) Meissners plexus is parasympathetic ONLY. 4 functions of the peritoneum (two layered structure which includes a serous membrane that forms the lining of the abdominal cavity) lubricates and allows movement for viscera secretes fluid containing leucocytes and antibodies which resists infection pathway for neurovascular bundles Also folds to: suspends the viscera (mesenteries) and attaches viscera to the body wall (ligaments) storage of fat e.g. greater and lesser omenta...
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Hindgut - foregut Lesser Splanchnic nerves (T10-T11) MIDGUT...

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