File:Cullen1916 fig16.jpg
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Fig. 16. Intra-abdominal View of the Umbilical Region of a Human Embryo 6.5 cm in Length
(X 9.)
A portion of the abdominal wall, including the umbilicus, has been excised. The bladder lies between the umbilical arteries and gradually diminishes in caliber toward the umbilicus. This is clearly seen in the cross-section projected in the lower picture. The umbilical vein emerges from the abdominal wall just above the umbilical region. The umbilical opening is closed, its former position being now recognized as several shallow pits in the peritoneum. To the left is a cross-section of the flattened cord, containing, in addition to the umbilical vessels, the allantois, which is obliterated at this point. There are no remnants of either exocoelom or omphalomesenteric structures.
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