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The intergluteal cleft or just gluteal cleft, also known by a number of synonyms, including natal cleft and cluneal cleft, is the groove between the buttocks that runs from just below the sacrum to the perineum, [1] so named because it forms the visible border between the external rounded protrusions of the gluteus maximus muscles.
The masses of the gluteus maximus muscle are separated by an intermediate intergluteal cleft or "crack" in which the anus is situated. The buttocks allow primates to sit upright without resting their weight on their feet as four-legged animals do. Females of certain species of baboon have red buttocks that
Anatomical terminology [ edit on Wikidata ] The gluteal sulcus (also known as the gluteal fold , tuck , fold of the buttock, , horizontal gluteal crease , or gluteal furrow ) is an area of the body of humans and anthropoid apes, described by a horizontal crease formed by the inferior aspect of the buttocks and the posterior upper thigh . [ 1 ]
The bulk of the gluteal muscle mass contributes only partially to shape of the buttocks. The other major contributing factor is that of the panniculus adiposus (fatty layer) of the buttocks, which is very well developed in this area, and gives the buttock its characteristic rounded shape. Exercise in general (not only of the gluteal muscles but ...
The formal anatomical boundaries of the perineum may be said to be: [6] in front: the pubic arch and the arcuate ligament of the pubis; behind: the tip of the coccyx; on either side: the inferior rami of the pubis and ischial tuberosity, and the sacrotuberous ligament; superiorly: pelvic floor [7] inferiorly: skin and fascia
Some types of butt rashes are more common than others: "Extremely common rashes are due to exercise [and] sweating while wearing tight clothing as well as sitting in them for long periods of time ...
The terms plumber butt or plumber's crack (Canadian, Australian, and American English) and builder's bum (British English) refer to the exposure of the buttock cleavage, especially on occasions of careless bending over. The expression "builder's bum" was first recorded in 1988.
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