The human anus from Latin anus meaning Spread female anus, "circle"   is the external opening of the rectum. Two sphincters control the exit of feces from the body during an act of defecationwhich is the primary function of the anus. These are the internal anal sphincter and the external anal sphincterwhich are circular muscles Spread female anus normally maintain constriction of the orifice and which relaxes as required by normal physiological functioning.
The inner sphincter is involuntary and the outer is voluntary. It is located behind the perineum which is located behind the vagina in females and behind the scrotum in males.
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With anal Spread female anusthe anus can play a role in sexuality. Attitudes towards anal sex vary and it is illegal in some countries. The anus is also the site of potential infections and other conditions, including cancer. The anus is the final component of the gastrointestinal tractand directly continues from the rectum. The anus passes through the pelvic floor.
The anus is surrounded by muscles. The top and bottom of the anus are surrounded by the internal and external anal sphincterstwo muscular rings which control defecation.
The anus is surrounded in its length by folds called anal valves, which converge at a line known as the pectinate line.
This represents the point of transition between the hindgut and the ectoderm in the embryo. Below this point, the mucosa of the Spread female anus anus becomes skin. The anus receives blood from the inferior rectal artery and innervation from the inferior rectal nerveswhich branch from the pudendal nerve.
The pseudostratified columnar epithelium of the gastrointestinal tract transitions to stratified squamous epithelium at the pectinate line. The stratified squamous epithelium gradually accumulates sebaceous and apocrine glands.
During pubertyas 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.
However, in some genetic populations androgenic hair is less common. 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 Spread female anus allows the feces to exit from the anus, finally, as the levator ani muscles pull the anus up over the exiting feces.
Example of a Grade IV hemorrhoidone that protrudes out of the anus. In psychologythe Freudian term anal fixation is used. The anus has a relatively high Spread female anus of nerve endings and can be an erogenous zoneSpread female anus can make anal intercourse pleasurable if performed properly.
The pudendal nerve that branches to supply the external anal sphincter also branches to the dorsal nerve of the clitoris and the dorsal nerve of the penis.
Sigmund Freud Spread female anus theory of psychosexual developmentfor example, described an anal stagehypothesizing that toddlers derive pleasure from retaining and expelling feces. This is the source of the term " anal-retentive " and the derived informal term "anal". In addition to nerve endings, pleasure from anal intercourse may be aided by the close proximity between the anus and the prostate for males, and vaginaclitoral legs and anal area for females.
This is because of indirect stimulation of the prostate and vagina or clitoral legs. Anal stretching or fisting is pleasurable for some, but it poses a more serious threat of damage due to the deliberate stretching of the anal and rectal tissues; its injuries include anal sphincter lacerations and rectal and sigmoid colon rectosigmoid perforation, which might result in death.
Anal intercourse is sometimes referred to as Spread female anus or buggeryand is considered taboo in a number of legal systems. It has been, and in some jurisdictions continues Spread female anus be, a crime carrying severe punishment. 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 is often used for this purpose, though anal cleansing practices vary greatly between cultures. Shaving, trimming, depilatory hair removalor Brazilian waxing can clear the perineum of hair.
Anal bleaching is a process in which the anus and perineum, which may darken after puberty depending on individual genetics, is lightened for a more youthful appearance. True anal piercing Spread female anus rare because it may interfere with the function of the anus.
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However, surface piercings of the perineum are easier to care for and much more common. The posterior aspect of the rectum and anus exposed by removing the lower part of the sacrum and the coccyx.
From Wikipedia, the free encyclopedia. It is not to be confused with Bunghole. The anus of a female left, with prominent perineal raphe and a male right. Spread female anus of Anal warts. Original from the University of Michigan: Original from Oxford University: Archived from the original on June 13, Retrieved July 23, Gray's anatomy for students.
The Orgasm Answer Guide. Retrieved January 20, From Cells to Society. Retrieved September 17, Retrieved November 6, Retrieved August 19, Warren; Carol Rinkleib Ellison . Houghton Spread female anus Original from the University of Virginia. Many men find anal intercourse more exciting than penile-vaginal intercourse because the anal opening is usually smaller and tighter than the vagina. Probably the forbidden aspect of anal intercourse also makes it more exciting for some people. Miletich; Tia Laura Lindstrom An Introduction to the Work of a Medical Examiner: From Death Scene to Autopsy Suite.
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Anatomical terminology [ edit on Wikidata ]. Look up anus in Wiktionary, the free dictionary. Wikimedia Commons has media related to Human anus. Cardiovascular system peripheral Artery Vein Lymphatic vessel Heart.
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The human anus is the...
Anal warts may occur only in one spot, or may spread to different parts of Genital warts in women may appear on the vulva, vagina, or cervix. Because, like fellow Quoran Johanna Kok, I've answered some interesting questions I'll actually give an answer to this. The rectum is a collection of muscles. Of the women studied, 38% had unprotected anal intercourse in the past year. Unprotected anal intercourse is a well-described Spread female anus factor for HIV and sexually . Sexual relationships, risk behaviour, and condom use in the spread of.