ANAT 1625 Embryology of the Gut

ANAT 1625 Embryology of the Gut - the loop enters the...

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The endoderm germ layer contributes the epithelia lining of the gut tube as well as the parenchyma of the liver (and the biliary apparatus) and pancreas. The gut tube is derived into three regions: The foregut, midgut, and hindgut. The forgut comprises cranial and caudal portions: The cranial portion gives rise to the pharynx. The caudal part becomes part of the esophagus, stomach and cranial half of the duodenum. The midgut endoderm gives rise to the mucosa of the second half of the duodenum, jejunum and Ilium and ascending colon, and two thirds of the transverse colon. It forms a rapidly elongating loop, which results in the formation of the physically elongating umbilical hernia. During this phase the midgut loop rotates counterclockwise direction firstly 90 degrees as
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Unformatted text preview: the loop enters the umbilical cord and on its return to the abdominal cavity, a further 180 degrees. This takes place during the 6 th through 10 th weeks. The hindgut endoderm gives rise to the mucosa of the rest of the transverse, descending, and sigmoid colon, as well as that of the rectum, and upper half of the anal cannel. It also gives rise to part of the lining of the unary tract. The lower half of the anal canal is derived from an ectodermal in growth, the proctodaeum. The smooth muscle, connective tissue , and visceral peritoneum of the whole of the gut tube is derived from the lateral plate splanchnopluric mesoderm....
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