So we all know how a bellybuttons outer end looks like, because we can just look at it. But what about the inner end? Whats on the inside of the bellybutton? Is it still conected to anything? Is it a tube that just ends?
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During pregnancy, the umbilical cord contains four structures, the umbilical vein, two umbilical arteries, and the allantois. Once they penetrate the abdominal wall of the fetus, they travel in different directions. The umbilical vein goes to the liver, the arteries to either side in the pelvis, and the allantois in the midline toward the bladder. They become smaller and smaller once they are no longer needed, but little remnants do exist even in adults. They are called the round ligament of the liver, the medial umbilical ligaments, and the urachus. They don’t really do anything.
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