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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In addition to blood vessels going through the umbilical cord there is a tube between the bladder and umbilicus that the fetal bladder uses to drain (urachus). In most this closes off, in some it can partially close leaving a cyst and in some it doesn’t close off and you can sometimes leak urine through your belly button.
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