Web Definition: Belly Button
The umbilicus, also called the navel, is essentially a scar representing the former attachment of the umbilical cord in the fetus. Colloquial terms for navel are belly button & tummy button. It can form a depression, a type of umbilicus commonly referred to as an innie, or a protrusion, referred to as an outie. The umbilicus of a shell is the axially aligned hollow cone within the whorls of a coiled gastropod shell, where no columella has been formed. This is the hole around which the inner surface of the shell is coiled. In species with a wide, open umbilicus, such as the Heath Snail, the spiral of the whorls can be perceived from the posterior end of the shell. The umbilicus can vary from very narrow & punctured to wide & shallow. Shells with a conspicuous umbilicus are always orthostylic, ie with a poorly developed columella. Sometimes there is a dimple or funnel-shaped depression, known as the umbilical region or the umbilical field, next to or at the basal hollow of the columella, when the walls of successive whorls are not closely wound against each other.
Read More »Dictionary Entry: The depression in the middle of the abdomen in humans left as a residue of the umbilical cord - the umbilicus - the navel{1}.
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