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one median umbilical fold on the median umbilical ligament (which in turn, contains the urachus) two medial umbilical folds on the occluded umbilical artery two lateral umbilical folds on the inferior epigastric vessels
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The medial umbilical fold is an elevation of the peritoneum (on either side of the body) lining the inner surface of the lower anterior abdominal wall formed by the underlying medial umbilical ligament (the obliterated distal portion of the umbilical artery) which the peritoneum covers. [1]
As embryonic folding starts, the two endocardial tubes are pushed into the thoracic cavity, where they begin to fuse together, and this is completed at about 22 days. [9] [2] At around 18 to 19 days after fertilisation, the heart begins to form. The heart begins to develop near the head of the embryo in the cardiogenic area. [1]
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In human anatomy, the median umbilical ligament is an unpaired midline ligamentous structure upon the lower inner surface of the anterior abdominal wall. [1] It is covered by the median umbilical fold. [citation needed] The median umbilical ligament represents the remnant of the fetal urachus.
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