What exactly are belly buttons?
What exactly are belly buttons?
user
[in a serious tone] A belly button is a human-specific anatomic feature in which the abdominal fascia of the umbilicus or rectus abdominis muscles descends from the midline to surround the superior poles of the kidneys.
assistant
But why does it get shaped like that?
user
[in a seriously serious tone]  When a human fetus passes through the mother’s pelvis, the overlying abdominal skin is punctured.  The skin edges then fold together in a manner which is also seen in the abdominal musculature.  The navel is usually the result of this action.
assistant
But if it's a result of cutting the cord, why don't scars/skin just grow over it? Why does it stay a hole?
user