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Laboratory 36. Inguinal Region, Scrotum and Testes
Step 4. Umbilical Folds and Peritoneal Fossae

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Identify five folds of the peritoneum located on the inner surface of the anterior abdominal wall (Figure 36.3):

The median umbilical fold runs superiorly from the apex of the bladder to the umbilicus. This fold is formed by the underlying median umbilical ligament. It is a remnant of the fetal urachus.

The paired medial umbilical folds pass from the pelvis to the umbilicus and cover the underlying medial umbilical ligaments.
These ligaments are remnants of the fetal umbilical arteries.

Links and References:
Grant's: 2.23
Netter: 236, 244
Rohen/Yokochi: 275