Black Haired Girl On The Chair With A Navel Tattoo

Human anatomy
The umbilicus is an important mark on the abdomen since its position is relatively consistent among 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 usually 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 reason for the occurrence of an outie is extra skin left from the umbilical cord or umbilical hernias, although a child with an umbilical hernia will not necessarily develop an outie. As well as the visible depression on a person's abdomen, 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 after birth.