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Encyclopedia > Anus
Male Human Anatomy
Male Human Anatomy
Female Human Anatomy

In anatomy, the anus (from Latin ānus "ring, anus") is the external opening of the rectum. Closure is controlled by sphincter muscles. Feces are expelled from the body through the anus during the act of defecation, which is the primary function of the anus. Most animals — from simple worms to elephants and humans — have a tubular gut, with a mouth at one end and an anus at the other. Look up anus in Wiktionary, the free dictionary. ... Image File history File links Drawing of the Male Internal Sexual Anatomy From alt. ... Image File history File links Drawing of the Male Internal Sexual Anatomy From alt. ... Image File history File links Fem_isa_2. ... Image File history File links Fem_isa_2. ... Human heart and lungs, from an older edition of Grays Anatomy. ... For other uses, see Latin (disambiguation). ... The rectum (from the Latin rectum intestinum, meaning straight intestine) is the final straight portion of the large intestine in some mammals, and the gut in others, terminating in the anus. ... Look up Sphincter in Wiktionary, the free dictionary. ... For other uses of Muscles, see Muscles (disambiguation). ... Horse feces Feces, faeces, or fæces (see spelling differences) is a waste product from an animals digestive tract expelled through the anus (or cloaca) during defecation. ... Anatomy of the anus and rectum For the death metal band Defecation, see Defecation (band). ... For the Physics term GUT, please refer to Grand unification theory The gastrointestinal or digestive tract, also referred to as the GI tract or the alimentary canal or the gut, is the system of organs within multicellular animals which takes in food, digests it to extract energy and nutrients, and... For other uses, see Mouth (disambiguation). ...


The anus plays a role in sexuality, though attitudes towards anal sex vary and it is even illegal in some countries. The anus is also the site of potential infections and other conditions including cancer. The subject is often considered a taboo part of the body, and is known by a large number of usually vulgar slang terms. Roman men having anal sex. ... Cancer is a class of diseases or disorders characterized by uncontrolled division of cells and the ability of these to spread, either by direct growth into adjacent tissue through invasion, or by implantation into distant sites by metastasis (where cancer cells are transported through the bloodstream or lymphatic system). ... This article is about cultural prohibitions in general, for other uses, see Taboo (disambiguation). ... The term vulgar originally meant of the common people, from the Latin vulgus. ... For other uses, see Slang (disambiguation). ...

Contents

Role in defecation

Main article: Defecation

Intra-rectal pressure builds as the rectum fills with feces, pushing the feces against the walls of the anal canal. Contractions of abdominal and pelvic floor muscles can create intra-abdominal pressure which further increases intra-rectal pressure. The internal anal sphincter (an involuntary muscle) responds to the pressure by relaxing, thus allowing the feces to enter the canal. The rectum shortens as feces are pushed into the anal canal and peristaltic waves push the feces out of the rectum. Relaxation of the internal and external anal sphincters allows the feces to exit from the anus, finally, as the levator ani muscles pull the anus up over the exiting feces. Anatomy of the anus and rectum For the death metal band Defecation, see Defecation (band). ... The rectum (from the Latin rectum intestinum, meaning straight intestine) is the final straight portion of the large intestine in some mammals, and the gut in others, terminating in the anus. ... The anal canal is the terminal part of the large intestine. ... The Sphincter ani internus (or internal anal sphincter) is a muscular ring which surrounds about 2. ... Peristalsis is the rhythmic contraction of smooth muscles to propel contents through the digestive tract. ... The Levator ani is a broad, thin muscle, situated on the side of the pelvis. ...


To prevent diseases of the anus[citation needed] and to promote general hygiene, humans often clean the exterior of the anus after emptying the bowels. A rinse with water from a bidet or a wipe with toilet paper are often used for this purpose. A toilet (left) and a bidet (right). ... This article does not cite any references or sources. ...


Role in sexuality

Main article: Anal sex

The anus has a relatively high concentration of nerve endings and is an erogenous zone. Sigmund Freud's theory of psychosexual development, for example, described an anal stage, hypothesizing that toddlers derive pleasure from retaining and expelling feces. This is the source of the term "anal" and the derived, derogatory vulgarism "anal-retentive." Roman men having anal sex. ... Nerves (yellow) Nerves redirects here. ... This article does not cite any references or sources. ... Sigmund Freud (IPA: ), born Sigismund Schlomo Freud (May 6, 1856 – September 23, 1939), was an Austrian neurologist and psychiatrist who founded the psychoanalytic school of psychology. ... The concept of psychosexual development, as envisioned by Sigmund Freud at the end of the nineteenth and the beginning of the twentieth century, is a central element in the theory of psychology. ... The Anal Stage in psychology is the term used by Sigmund Freud to describe the development during the second year of life, in which an childs pleasure and conflict centers are in the anal area. ... A word or phrase is pejorative or derogatory (sometimes misspelled perjorative) if it expresses contempt or disapproval; dyslogistic (noun: dyslogism) is used synonymously (antonyms: meliorative, eulogistic, noun eulogism). ... The term anal retentive (or anally retentive) is one of a variety of examples of Freudian terminology which have found their way into common usage with a slight shift in the original meaning. ...


Anal intercourse can be pleasurable for both the insertive partner and the receptive partner. For the receptive partner, pleasure from anal intercourse is also thought to be related to the shared wall between the rectum and the vagina (for females) as well as the G-spot or prostate (for males). For the insertive partner, the tightness of the anus is often said to be a source of pleasure in penetrative anal sex. Anal intercourse, sometimes referred to as sodomy or buggery, is a human sexual activity, but is considered taboo in a number of moral systems, and it has been, and in some jurisdictions continues to be, a crime carrying severe punishment. Roman men having anal sex. ... The vagina, (from Latin, literally sheath or scabbard ) is the tubular tract leading from the uterus to the exterior of the body in female placental mammals and marsupials, or to the cloaca in female birds, monotremes, and some reptiles. ... ... The prostate is a compound tubuloalveolar exocrine gland of the male mammalian reproductive system. ... François Elluin, Sodomites provoking the wrath of God, from Le pot pourri de Loth (1781). ... Anal sex or anal intercourse is a form of human sexual behavior. ... This article is about cultural prohibitions in general, for other uses, see Taboo (disambiguation). ... This article does not cite any references or sources. ...


Anal sexual activity need not include penetration. The anus also plays an important role in facesitting, coprophilia and anilingus. Drawing by Francesco Hayez Facesitting, also known as kinging or queening, is a sexual practice in which one partner sits on or over the others face, typically to allow oral-genital or oral-anal contact, or to further ass worship or body worship. ... Look up coprophilia in Wiktionary, the free dictionary. ... Anal-oral contact Anal-oral contact, also referred to as anal-oral sex, rimming, or anilingus (from anus and lingua), is a form of oral sex involving contact between the anus or perineum of one person and the mouth of another. ...


Anal stretching can stimulate the nerves around the anus and can be considered pleasurable. Care must be taken to maintain elasticity.


Lubricant is widely regarded as a necessity while performing anal sex.


Puberty

During puberty, as testosterone triggers androgenic hair growth on the body, pubic hair begins to appear around the anus. Although initially sparse, it fills out by the end of puberty, if not earlier. Puberty refers to the process of physical changes by which a childs body becomes an adult body capable of reproduction. ... Distribution of androgenic hair on female and male body Androgenic hair is caused by the rising level of male hormones (androgens) due to puberty that causes a transformation process of vellus hair into terminal hair on several parts of the human body. ...


Health

Human male anus.
Human female anus.
Human female anus.

Hygiene is important for good anal health and anal sex. Washing with a mild soap and water will keep the anus clean. Harsh soaps or wiping vigorously with toilet paper can irritate the skin around the anus, making it itchy or sore. Pinworms are sometimes the source of anal itching. Image File history File links Metadata Size of this preview: 498 × 600 pixelsFull resolution (1655 × 1993 pixel, file size: 322 KB, MIME type: image/jpeg) File historyClick on a date/time to view the file as it appeared at that time. ... Image File history File links Metadata Size of this preview: 498 × 600 pixelsFull resolution (1655 × 1993 pixel, file size: 322 KB, MIME type: image/jpeg) File historyClick on a date/time to view the file as it appeared at that time. ... Image File history File linksMetadata Download high-resolution version (922x908, 141 KB) File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Anus Metadata This file contains additional information, probably added from the digital camera or scanner used to create... Image File history File linksMetadata Download high-resolution version (922x908, 141 KB) File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Anus Metadata This file contains additional information, probably added from the digital camera or scanner used to create... The pinworm (Genus Enterobius) is a parasitic roundworm of the phylum Nematoda. ... Pruritus ani is a medical term which refers to persistent itching of the anus (and in Latin means literally the same thing). ...


Care should be taken not to strip the anus of natural oils that keep the skin around the opening supple and elastic.


Penetration with a penis or sex toy can irritate or tear the inside of the anus. Lubrication is often recommended to ease penetration. The risk of injury to the anal sphincter should be a concern. Similarly if the anus is torn, this can occasionally cause a fistula formation which can not only cause fecal leaking, but also can be very difficult to treat. A sex toy is a term for any object or device that is primarily used in facilitating human sexual pleasure. ...


Kegel exercises can improve the tone of the outer sphincter muscle. A Kegel exercise, named after Dr. Arnold Kegel, is an exercise designed to strengthen the pubococcygeus muscles. ...


Cosmetics

Shaving, trimming, depilatory (hair removal), or Brazilian waxing can clear the perineum of hair. Hair removal describes any method of removing hair, especially from the human body. ... Brazilian waxing is a type of waxing involving the bikini area. ...


Anal bleaching is a process where the perineum, which darkens over the years, is lightened for a more youthful appearance. This practice has been linked to anal incontinence, and other health problems. Anal bleaching is the practice of bleaching the darker pigmentation of the skin of light-skinned people, around the anus. ...


Anal piercing is among the more extreme piercings and usually interferes with the function of the anus. An anal piercing is a body piercing in the anus or the surrounding area. ...


Pathology

Diseases of the anus include anal cancer, abscess, warts, fistula, anal fissure, itching and hemorrhoid. The anus is also a frequent site of sexually transmitted infections. These benefit from medical intervention. Anal cancer is a distinct entity from the more common colorectal cancer. ... For the death metal band, see Abscess (band). ... A wart is generally a small, rough tumor, typically on hands and feet, that can resemble a cauliflower or a solid blister. ... In medicine, a fistula (pl. ... An anal fissure is an unnatural crack or tear in the anus skin. ... For other uses, see Itch (disambiguation). ... Hemorrhoids (AmE), haemorrhoids (BrE), emerods, or piles are varicosities or swelling and inflammation of veins in the rectum and anus. ... Sexually-transmitted infections (STIs), also known as sexually-transmitted diseases (STDs), are diseases that are commonly transmitted between partners through some form of sexual activity, most commonly vaginal intercourse, oral sex, or anal sex. ...


Birth defects of the anus include stenosis and imperforation. These benefit from surgical intervention. A congenital disorder is a medical condition or defect that is present at or before birth (for example, congenital heart disease). ... A stenosis is an abnormal narrowing in a blood vessel or other tubular organ or structure. ... An imperforate anus or anal atresia is a birth defect in which the rectum is malformed. ...


Damaged anal sphincter (patulous anus in more severe cases) — caused by careless or sometimes necessarily sacrificial surgery in the perineal region or by rough/abrupt penetration in anal sex — can lead to flatus and/or fecal incontinence, chronic constipation and, ultimately, megacolon. Male Anatomy The anus, in anatomy, is the external opening of the rectum. ... In human anatomy, the perineum, also called the taint, or gooch, is generally defined as the surface region in both males and females between the pubic symphysis and the coccyx. ... Roman men having anal sex. ... Flatus is a semi-retired webcomic featured on The Double S webpage (www. ... Fecal incontinence is the loss of regular control of the bowels. ... Constipation or irregularity, is a condition of the digestive system where a person (or animal) experiences hard feces that are difficult to egest; it may be extremely painful, and in severe cases (fecal impaction) lead to symptoms of bowel obstruction. ... Megacolon is an abnormal dilatation of the colon (a part of the large intestines) that is not caused by mechanical obstruction. ...


In psychology the Freudian term anal fixation is used. Psychological science redirects here. ... Sigmund Freud (IPA: ), born Sigismund Schlomo Freud (May 6, 1856 – September 23, 1939), was an Austrian neurologist and psychiatrist who founded the psychoanalytic school of psychology. ... The term anal-retentive (or anally retentive) is one of a variety of examples of Freudian terminology that have found their way into common usage with a slight shift in the original meaning. ...


Additional images

See also

Look up anus in Wiktionary, the free dictionary.
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  Results from FactBites:
 
eMedicine - Imperforate Anus : Article by Nelson G Rosen (7706 words)
The rectum and anus are believed to develop from the dorsal potion of the hindgut or cloacal cavity when lateral ingrowth of the mesenchyme forms the urorectal septum in the midline.
The anus develops by a fusion of the anal tubercles and an external invagination, known as the proctodeum, which deepens toward the rectum but is separated from it by the anal membrane.
Stenosis: This is a narrowing of the new anus.
Anus language - Uncyclopedia, the content-free encyclopedia (533 words)
Anus language is not associated whatsoever with the anus of anatomy.
Anus language is distinctive in that instead of using vocal communcation, communication is sometimes done via the anal opening.
Anus language is widely recognized as the foremost language in which to express blasphemy, swear-words and other unpleasantries.
  More results at FactBites »

 
 

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