Saturday 31 March 2012

BRANCHIOSTOma-INTESTINE

The gut is long as the pharynx .It is suspended from the dorsal bodywall by a dorsal mesentery into the atrial cavity. It is covered by a thin layer of smooth muscles and its internal epithelial lining has several ciliated tracts. The intestine can differentiated into three parts midgut. The large blind pouch or diverticulum arises from the juctions of oesophagus and midgut. The lining of midgut on the right lateral side bears a crescentic lateral ciliary tract. Its cilia beat downwards directing food into the midgut diverticulum. Midgut is followed by a densely ciliated ilio-colic ring .The hind gut is narrower.The terminal part or rectum is heavily ciliated and opens to outside by anus.

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