The navel
The navel is part of the external structure of the human body. It is a reference point of the adipose tissue.
It is a round scar in the middle of the belly, above the iliac crests.
It is the scar left by the umbilical cord when it breaks and dries.
More information:
Anatomy of the human body by Gray, Henry, 1825-1861; Lewis, Warren Harmon, 1870_p. 1314
Go to “Measurement reference points”