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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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- Winter '11