Navel

umbilicusbelly buttonbellybuttoninniebelly buttonsbelly-buttonParaumbilicalumbilical
The navel (clinically known as the umbilicus, colloquially known as the belly button) is a protruding, flat, or hollowed area on the abdomen at the attachment site of the umbilical cord.wikipedia
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Umbilical cord

umbilicalcord[umbilical] cord
The navel (clinically known as the umbilicus, colloquially known as the belly button) is a protruding, flat, or hollowed area on the abdomen at the attachment site of the umbilical cord.
The umbilical cord enters the fetus via the abdomen, at the point which (after separation) will become the umbilicus (or navel).

Umbilical ring

Around the cord remnant, is the "umbilical collar", formed by the dense fibrous umbilical ring.
The umbilical ring is a dense fibrous ring surrounding the umbilicus at birth.

Umbilical hernia

umbilicalhernia, umbilicalabdomen
Outies are sometimes mistaken for umbilical hernias; however, they are a completely different shape with no health concern, unlike an umbilical hernia.
An umbilical hernia is a health condition where the abdominal wall behind the navel is damaged.

Abdomen

abdominalabdominal musclesbelly
The navel (clinically known as the umbilicus, colloquially known as the belly button) is a protruding, flat, or hollowed area on the abdomen at the attachment site of the umbilical cord.
It originates at the pubic bone and is inserted into the linea alba halfway up to the navel.

Tendinous intersection

tendinous intersections
One is usually situated at the level of the umbilicus, one at the extremity of the xiphoid process, and the third about midway between the two.

Midriff

midsectionmidriff exposureBelly
The public exposure of the male and female midriff and bare navel was considered taboo at times in the past in Western cultures, being considered immodest or indecent.
However, exposure of the female midriff and navel was widely brought into everyday Western women's fashion in the 1960s' sexual revolution and later with the popularity of halters, tube tops and crop tops in the 1970s.

Dermatome (anatomy)

dermatomedermatomesdermatomic area
The skin around the waist at the level of the umbilicus is supplied by the tenth thoracic spinal nerve (T10 dermatome).

Navel piercing

navel piercingsBelly button piercingbelly button ring
Exposure of the male navel has rarely been stigmatised and has become particularly popular in recent years, due to the strong resurgence of the male crop top and male navel piercing The navel and midriff are often also displayed in bikini s, or when low-rise jeans are worn.
A navel piercing (also referred to as a belly button piercing or an umbilical dip piercing) is a type of piercing located through, in, or around, the navel.

Urachus

Directly behind the navel is a thick fibrous cord formed from the umbilical cord, called the urachus, which originates from the bladder.
The apex of the bladder stretches and is connected to the umbilicus as a narrow canal.

Indecent exposure

public indecencyexposing himselfflasher
The public exposure of the male and female midriff and bare navel was considered taboo at times in the past in Western cultures, being considered immodest or indecent.
An adult woman exposing her navel was also considered indecent in the West into the 1960s and 1970s, and even as late as the 1980s.

Low-rise pants

low-rise jeansbumsterslow rise pants
Exposure of the male navel has rarely been stigmatised and has become particularly popular in recent years, due to the strong resurgence of the male crop top and male navel piercing The navel and midriff are often also displayed in bikini s, or when low-rise jeans are worn.
Low-rise pants, also known as "low-cut jeans", "lowriders" or "rap pants", are a type of pants that sit low on, or below, the hips, usually at least 8 centimetres (3 inches) lower than the navel.

Umbilicoplasty

To minimize scarring, the navel is a recommended site of incision for various surgeries, including transgastric appendicectomy, gall bladder surgery, and the umbilicoplasty procedure itself.
Umbilicoplasty, sometimes referred to as "belly button surgery", is a plastic surgery procedure to modify the appearance of one's navel (or "belly button").

Sari

sareesareesshari
While the West was relatively resistant to navel-baring clothing until the 1980s, it has long been a fashion with Indian women, often displayed with Saris or Lehengas.
In ancient Indian tradition and the Natya Shastra (an ancient Indian treatise describing ancient dance and costumes), the navel of the Supreme Being is considered to be the source of life and creativity, hence the midriff is to be left bare by the sari.

Manipura

ManipooragaManipooragamMaṇipūraka
Buddhism refers to the chakra of the navel as the manipura.
Located above the navel or slightly below the solar plexus, Manipura translates from Sanskrit as "resplendent gem" or "lustrous gem" (alternatively or wrongly translated as "city of jewels").

Navel fetishism

Alvinophilianavelnavel fetishists
Navel fetishism, belly button fetishism, or alvinophilia is a partialism in which an individual is attracted to the human navel.

Omphaloskepsis

navel-gazingOmphaloscopoimeditation
Omphaloskepsis or navel-gazing is contemplation of one's navel as an aid to meditation.

Omphalos hypothesis

Last Thursdayismfive minute hypothesisAdam's navel
The idea was named after the title of an 1857 book, Omphalos by Philip Henry Gosse, in which Gosse argued that in order for the world to be "functional", God must have created the Earth with mountains and canyons, trees with growth rings, Adam and Eve with hair, fingernails, and navels (ὀμφαλός omphalos is Greek for "navel"), and that therefore no empirical evidence about the age of the Earth or universe can be taken as reliable.

Skin flora

skin microbiotacutaneous floramicrobiome
The umbilicus, or navel, is an area of the body that is rarely exposed to UV light, soaps, or bodily secretions (the navel does not produce any secretions or oils) and because it is an almost undisturbed community of bacteria it is an excellent part of the skin microbiome to study.

Placentalia

placentalplacental mammalplacental mammals
All placental mammals including humans have a navel.

Mammal

mammalsMammaliamammalian
All placental mammals including humans have a navel.

Spinal nerve

spinal nervescervical nervessacral nerves
The skin around the waist at the level of the umbilicus is supplied by the tenth thoracic spinal nerve (T10 dermatome).

Vertebra

vertebraeneural spineneural arch
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.

Centimetre

cmcentimetercentimeters
The navel (specifically abdominal wall) would be considered an umbilical hernia if the protrusion were 5 centimeters or more.