Scientists have discovered a new abdominal structure called the umbilical sheath, which anchors the remnant of the umbilical cord to deep abdominal tissues and helps determine the shape of your navel
Več na: https://www.newscientist.com/article/2498288-we-now-know-why-a-belly-button-becomes-an-innie/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home
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