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Buttocks

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Buttocks
Male human buttocks.
Female human buttocks
Artery superior gluteal artery, inferior gluteal artery
Nerve superior gluteal nerve, inferior gluteal nerve, cluneal nerves
MeSH Buttocks
Bottom commonly refers to the human buttocks but also has other uses.

The buttocks (singular: buttock) are rounded portions of the anatomy located on the posterior of the pelvic region of the apes, including humans and many other bipeds or quadrupeds.

Contents

Anatomy

The buttocks are formed by the masses of the gluteal muscles or 'glutes' (the gluteus maximus and the gluteus medius) superimposed by a layer of fat. The superior aspect of the buttock ends at the iliac crest, and the lower aspect is outlined by the horizontal gluteal crease. The gluteus maximus has two insertion points: 1/3 superior portion of the linea aspera of the femur, and the superior portion of the iliotibial tractus. The masses of the gluteus maximus muscle are separated by an intermediate gluteal cleft or "crack" in which the anus is situated.

The buttocks allow primates to sit upright without needing to rest their weight on their feet as four-legged animals do.

Some baboons and all gibbons, though otherwise fur-covered, have characteristic naked callosities on their buttocks. While girls and boys generally have smooth, so-called 'baby-bottoms', mature males and females have varying degrees of hairgrowth, as on other parts of their body. Females generally have hair growth in the crack (particularly around the anus), often extending laterally onto the lower aspect of the cheeks. In addition to such areas, males often have hair growth over the most of (or the entire) the buttocks.

Connotations

The English word of Greek origin "callipygian" indicates someone who has beautiful buttocks. However, the qualities that make buttocks "beautiful" or "well-formed" are not fixed, as sexual aesthetics of the buttocks vary considerably from culture to culture, from one period of fashion to another and even from person to person.

In ancient astrology, various parts of the body were associated with signs of the zodiac - e.g. the buttocks to the Balance. Depending on the context, exposure of the buttocks in non-intimate situations often causes feelings of shame, embarrassment or humiliation in a non-exhibitionist subject, and embarrassment or amusement in a non-voyeurist audience (see "pantsing"). Expressions such as being "caught with one's pants/ trousers down" or more explicitly in Dutch, "met de billen bloot" ("with bared buttocks"), use the image as a metaphor for non-physical embarrassment as well.

Students at Stanford University conduct a "mass-mooning" in May 1995.
Students at Stanford University conduct a "mass-mooning" in May 1995.

Willfully exposing one's own bare buttocks as a protest, a provocation, or just for fun (especially but not exclusively practiced by youngsters such as North American frat boys) is called "mooning".

A "wedgie" is pulling someone's undergarments or swimming trunks up through their buttock "crack" to be hauled over the top of the victim's trousers, sometimes partially baring the victim's buttocks.

It is no coincidence that the English verb to spank is the only one specifically meant for physical discipline of a specific part of the body, and various other languages have terms specifically referring to spanking; in many punitive traditions, the buttocks are the preferential target for painful lessons, from educational to judicial, as offering them for punishment (especially divested) adds a psychological dose of embarrassment and even sexual humiliation to the pain, which can be meted out with less risk of long-term corporal harm than elsewhere. There are, in various cultural traditions, expressions like "A black man's ears are in his buttocks" (e.g. in Uganda).

Many comedians, writers and others rely on the buttocks in these and other ways (such as flatulence and toilet humor) as a source of amusement, camaraderie and fun, despite (or in some cases for the sake of) the risk of being in dubious taste, if not censored.

Because in most cultures the buttocks are rarely shown naked, they are generally considered unsuitable for ornamental body markings and body modification, but may be preferential for discreet markings, such as secretive membership proof or to be shown in intimate company (e.g. amongst lovers).

In American English, phrases use the buttocks or synonyms (especially butt and arse/ass) as a pars pro toto for a whole person, but generally with a negative connotation. For example, terminating an employee may be described as "firing his ass". One might say "move your ass" or "haul ass" (or the polite, understood euphemisms "move it" or "haul it") as an exhortation to greater haste or urgency. Expressed as a function of punishment, defeat or assault becomes "kicking one's ass". Such phrases also may suggest a person's characteristics, e.g. difficult people are termed "hard asses" (polite euphemism: "hard nosed"). People deemed excessively puritanical or proper may be termed "tight asses". An annoying person or any source of frustration may be termed "a pain in the ass" (euphemism: "a pain in the neck", though some claim that this alleged euphemism actually appeared in English earlier than the former).

Certain physical dispositions of the buttocks — particularly size — are sometimes identified, controversially, as a racial characteristic (see race). The most famous intersection of racism and buttocks may be the case of Saartjie Baartman, the so-called Hottentot Venus.

Synonyms

Look up buttocks in Wiktionary, the free dictionary.

The anatomical Latin name for the buttocks is nates (pronounced /ˈneɪtiːz/ in English), which is plural; the singular, natis (buttock), is rarely used. As buttocks are an object of both shame and fascination, it is not surprising that there are many colloquial terms, euphemistic, ironic or other, to refer to them. These include the following:

  • backside, posterior, behind and its derivates (hind-quarters, hinder or the childish homophone heinie, strictly the whole body behind the hind leg-trunk attachment), rear or rear-end, derrière (French for "behind") - all strictly positional descriptions, as the inaccurate use of rump (as in 'rump roast', after a 'hot' spanking), thighs, upper legs; analogous are:
    • aft, stern and poop, naval in origin; in nautical jargon, buttocks also designates the aftermost portion of a hull above the water line and in front of the rudder, merging with the run below the water line
    • caboose, originally a ship's galley in wooden cabin on deck; also the "rear end" car of a freight train, considered a cute synonym suitable for any audience
      Image:Fremont naked cyclists 2007 - 59.jpg
      Nude cyclists with painted buttocks
    • bottom (and the shortening "bot" as well as childish diminutives "bottie" or "botty"), but the use of similar-sounding booty (slang for the female body since the 1920s) as famously by K.C. and the Sunshine Band's Shake Your Booty, is an 'artistic liberty'; equivalents in other languages include the Latino culo from Latin culus, 'bottom'
    • tail (strictly anatomically a zoomorphism, humans only have a tail-bone, yet the illogical tail feather was popularized by musicians; also used for the even more sensual phallus) and tail-end
    • Tush or tushy (from the Yiddish language "tuchis" or "tochis" meaning "under" or "beneath")
    • Dumper sometimes denotates the buttocks, especially when talking about a large butt.
    • trunk, in American English, particularly when describing large buttocks "junk in the trunk". This usage refers metaphorically to an automobile's trunk.
  • arse or ass, asshole, and (butt-)hole - a pars pro toto (strictly only the actual body cavity and directly adjoining anal region); also used as an insult for a person. The term is Anglo-Saxon dialect, and therefore dates back over a thousand years.
  • fuck bucket or fuckbuck, fuck bucket, and (fuck-)bucket
  • badonkadonk - onomatopoeic slang meaning the voluptuously bouncing, large yet firm buttocks of a woman
  • breech, a metaphorical sense derived from on older form of the garment breeches (as the French culotte meaning pantoloons, via cul from Latin culus 'butt'), so 'bare breech' means without breeches, i.e. trouserless butt
  • bum - in British English, used frequently in the United Kingdom, Ireland, Canada, Australia, New Zealand and many other English speaking Commonwealth countries, also historically in U.S., is a mild often humorous reference to buttocks, not necessarily in vulgar or sexual context: "I've a boil on my bum, thrice as large as my thumb" - The Judge With The Sore Rump, St. George Tucker. Also used in reference to anal intercourse, often as an insult, as in bum boy (for a homosexual). Also verb - to practise anal intercourse.
  • buns, mounds (cfr. Butte, a geographical mound, known since 1805 in American English, from (Old) French butte "mound, knoll") and orbs - shape-metaphors, used mostly to describe male buttocks only
  • bund - derived from Punjabi
  • bunda - bottom, of Brazilian Portuguese origin.
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Khoikhoi woman exhibiting steatopygia.
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