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Innervation and control of GIT

Innervation of GIT; it is innervated by two systems. The autonomic nervous system (extrinsic) and the Enteric Nervous System (intrinsic)

  1. Extrinsic innervation; is from autonomic nervous system i. e. by both parasympathetic and sympathetic nerve fibers. There supply is denser near the oral cavity and anus. They make connections with enteric nervous system.

    • Parasympathetic innervation; is from the cranial and sacral divisions

      Cranial fibers originate from medulla and come out through vagus. The fibers supply to esophagus, stomach, small intestine, pancreas and proximal part of the large intestine

      Sacral fibers; originate in sacral part of spinal cord pass through… (354 more words) …

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Histology of GIT

In general the wall of GIT has following four layers;

  1. Mucosa; is innermost consisting of

    • Surface epithelial layer; is in contact with the lumen of GIT. The epithelial cells at their edges are tightly bound to each other. Epithelium is mainly stratified squamous epithelium. In stomach and intestine cells are tall columnar. The shape of the cell changes depending upon the function of the part of GIT. It forms gastric glands in the stomach, and villi and intestinal glands in small intestine. At places epithelium contains endocrine cells enterochromaffin cells which secret local hormone.

    • Lamina propria; made… (346 more words) …

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