We now know why a belly button becomes an 'innie'

New ScientistTuesday, September 30, 2025 at 8:27:38 PM
PositiveScience
We now know why a belly button becomes an 'innie'
Scientists have made an exciting discovery about why belly buttons become 'innies.' They've identified a new abdominal structure called the umbilical sheath, which anchors the remnant of the umbilical cord to deep abdominal tissues. This finding not only sheds light on the anatomy of our bodies but also enhances our understanding of human development, making it a significant step in medical science.
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