Black Haired Girl On The Chair With A Navel Tattoo

In humans, the scar can appear as a depression (often referred to colloquially as an innie) or as a protrusion (outie). Although they can be separated into these two categories, navels actually vary quite widely among people in terms of size, shape, depth/length, and overall appearance. As navels are scars, and not in any way defined by genetics, they can serve as a way of distinguishing between identical twins in the absence of other identifiable marks.
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.