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The umbilicus is a prominent mark on the abdomen, with its position being relatively consistent amongst humans. The skin around the waist at the level of the umbilicus is supplied by the tenth thoracic spinal nerve(T10 dermatome). The umbilicus itself typically lies at a vertical level corresponding to the junction between the L3 and L4 vertebrae, with a normal variation among people between the L3 and L5 vertebrae. The umbilicus forms a visible depression on the skin of the abdomen, and the underlying abdominal muscle layers also present a concavity; thinness at this point contributes to a relative structural weakness, making it susceptible to hernia . During pregnancy, the uterus presses the navel of the pregnant woman outward; it usually retracts again after birth.
The umbilicus is used to visually separate the abdomen into quadrants. The navel is the center of the circle enclosing the spread-eagle figure in Leonardo da Vinci’s Vitruvian Man drawing. The navel is rarely the focus in contemporary art and literature.
In humans, the navel scar can appear as a depression (often referred to colloquially as an “innie”) or as a protrusion (“outie”). About 90% of humans have innies. The occurrence of an “outie” navel is caused by the extra scar tissue left from the umbilical cordor from umbilical hernias, although the latter does not always cause an “outie” to develop. Frequently separated into just those two categories, navels vary quite widely among people in terms of size, shape, depth, length, and overall appearance.
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