The pectinate linewhich separates the internal from the external anus, can be seen. The anus is the final part of the gastrointestinal tractand directly continues from the rectum.
The anus passes through the pelvic floor. The anus is surrounded by muscles.
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The top and bottom of the anus are surrounded by the internal and external anal sphincterstwo muscular rings which control defecation. This represents the point of transition between the hindgut and the ectoderm in the embryo.
Below this point, the mucosa of Singles for nsa near Columbia Missouri il internal 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 stratified squamous epithelium gradually accumulates sebaceous and apocrine glands.
Although initially sparse, it fills Woman seeking sex tonight Boneville by the end of puberty, if not earlier. However, in some genetic populations androgenic hair is less common.
Human anus - Wikipedia
Function Main article: Defecation Intra-rectal pressure builds as Single housewives seeking hot sex Greensburg 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.
Clinical ificance Anal fissureswhich are tears in the external lining of the lining mucosa Sexy woman milton nh the anus.
These are exquisitely painful, with pain occurring after a motion is passed; other symptoms may include minor bleeding, discharge, or itch. Haemorrhoids may cause bleeding after passing a motion; may be painful; may cause an itch; and may prolapse Lf the right girl of the anus.
Some haemorrhoids require surgery to manage, which may involve placing a band around the haemorrhoidin order for it to lose blood supply; or surgical excision.
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They may get bigger, enlarging in the direction of the rectum, and resulting in an abnormal connection called an anorectal fistula. They are usually managed with surgical drainage  and antibiotics.
June Anal canceralso called "anal carcinoma", and Anal intraepithelial neoplasia Other Itchiness, called Pruritus anican affect the anus area. It is most often due to long-term exposure of the anus to faeces, with reasons including diseases of the anus such as haemorrhoids, fistulas and fissues; poor hygiene or chronic diarrhoea; local infections such as tapeworm and thrushskin conditions such as psoriasis and contact dermatitis. Tumkur Central African Republic sex fucking girls
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If there is a specific cause identified, the cause may be treated to relieve the itch. Otherwise, treatment includes keeping the area clean and dry, ceasing topical creams and ointments, and potentially bulk-forming laxatives to reduce the chance of faecal contamination.