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Umbilicus may refer to: The navel or belly button; Umbilicus (mollusc), a feature of gastropod, Nautilus and Ammonite shell anatomy; Umbilicus, a genus of over ninety species of perennial flowering plants; Umbilicus urbis Romae, the designated center of the city of Rome from which and to which all distances in Rome and the Roman Empire were ...
The umbilicus soli is located under the center of the cross (line D-U) Umbilicus soli (the "ground navel") was the name for the reference point of the Roman surveying tool, the groma , located at the moving end of a swinging arm, with a plumb bob suspended underneath.
Shells of two different species of sea snail: on the left is the normally sinistral (left-handed) shell of Neptunea angulata, on the right is the normally dextral (right-handed) shell of Neptunea despecta The shell of a large land snail (probably Helix pomatia) with parts broken off to show the interior structure. 1 – umbilicus
The term umbilicus is often used in descriptions of gastropod shells, i.e. it is a feature present on the ventral (or under) side of many (but not all) snail shells, including some species of sea snails, land snails, and freshwater snails.
The umbilicus is small and shallow, the suture only slightly sinuous. The siphuncle is unknown. Obinautilus has also been placed in Nautilidae by some authorities, though it may instead be an argonautid octopus .
In placental mammals, the umbilical cord (also called the navel string, [1] birth cord or funiculus umbilicalis) is a conduit between the developing embryo or fetus and the placenta. During prenatal development , the umbilical cord is physiologically and genetically part of the fetus and (in humans) normally contains two arteries (the umbilical ...
Anatomical structures are often described in relation to landmarks, such as the umbilicus, sternum, or anatomical lines like the midclavicular line (from the center of the clavicle). The term cephalon or cephalic region refers to the head, which is further divided into the cranium (skull), facies (face), frons (forehead), oculus (eye area ...
Surrounding the umbilical collar is the periumbilical skin. Directly behind the navel is a thick fibrous cord formed from the umbilical cord, called the urachus, which originates from the bladder. [5] The belly button is unique to each individual due to it being a scar, and various general forms have been classified by medical practitioners.