Anus Penis

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Anus Penis

From Wikipedia, the free encyclopedia
"Bumhole" redirects here. Not to be confused with Bunghole .
Scheme of digestive tract , with anus marked.
The anus of a female with a prominent perineal raphe (left) and a male with anal pubic hair (right).
This section needs expansion . You can help by adding to it . ( June 2020 )
Look up anus in Wiktionary, the free dictionary.
Wikimedia Commons has media related to Human anus .

^ Martim de Albuquerque (1873). Notes and Queries . Original from the University of Michigan: Oxford University Press. p. 119.

^ Edward O'Reilly; John O'Donovan (1864). An Irish-English Dictionary . Original from Oxford University: J. Duffy. p. 7.

^ Schubert, MC; Sridhar, S; Schade, RR; Wexner, SD (July 2009). "What every gastroenterologist needs to know about common anorectal disorders" . World J Gastroenterol . 15 (26): 3201–09. doi : 10.3748/wjg.15.3201 . ISSN 1007-9327 . PMC 2710774 . PMID 19598294 .

^ "Anal Cancer" . The Lecturio Medical Concept Library . Retrieved 24 July 2021 .

^ Jump up to: a b c d "Anal Sex, defined" . Discovery.com . Archived from the original on June 13, 2002 . Retrieved July 23, 2013 .

^ Jump up to: a b Drake, Richard L.; Vogl, Wayne; Tibbitts, Adam W.M. Mitchell (2005). Gray's anatomy for students . illustrations by Richard; Richardson, Paul. Philadelphia: Elsevier/Churchill Livingstone. ISBN 978-0-8089-2306-0 .

^ Moore, Keith L.; Dalley, Arthur F.; Agur, A. M. R. (2013-02-13). Clinically Oriented Anatomy . Lippincott Williams & Wilkins. ISBN 9781451119459 .

^ Deakin, Barbara Young; et al. (2006). Wheater's functional histology : a text and colour atlas . drawings by Philip J. (5th ed.). Churchill Livingstone/Elsevier. ISBN 978-0-443-06850-8 .

^ Jump up to: a b c d e f g h i j Ralston, Stuart H.; Penman, Ian D.; Strachan, Mark W.; Hobson, Richard P. (eds.) (2018). "Anorectal disorders". Davidson's principles and practice of medicine (23rd ed.). Elsevier. pp. 835–6. ISBN 978-0-7020-7028-0 . {{ cite book }} : |first4= has generic name ( help )

^ "Anorectal Abscess" . Johns Hopkins Medicine . Retrieved 10 August 2021 .

^ Ansorge, R; Robinson, J (15 September 2019). "Anal Abscess" . WebMD . Retrieved 10 August 2021 .

^ "Anal Cancer" . The Lecturio Medical Concept Library . Retrieved 10 August 2021 .

^ "Megacolon" . The Lecturio Medical Concept Library . Retrieved 10 August 2021 .

^ Jump up to: a b Komisaruk, Barry R. ; Whipple, Beverly ; Nasserzadeh, Sara ; Beyer-Flores, Carlos (2009). The Orgasm Answer Guide . JHU Press. pp. 108–109. ISBN 978-0-8018-9396-4 . Retrieved January 20, 2014 .

^ Rosenthal, Martha (2012). Human Sexuality: From Cells to Society . Cengage Learning . pp. 133–135. ISBN 978-0-618-75571-4 . Retrieved September 17, 2012 .

^ Natasha Janina, Valdez (2011). Vitamin O: Why Orgasms Are Vital to a Woman's Health and Happiness, and How to Have Them Every Time! . Skyhorse Publishing Inc. p. 79. ISBN 978-1-61608-311-3 . Retrieved November 6, 2011 .

^ "Anal Sex Safety and Health Concerns" . WebMD . Retrieved August 19, 2013 .

^ Joann S. DeLora; Carol A. B. Warren; Carol Rinkleib Ellison (2008) [1981]. Understanding Sexual Interaction . Houghton Mifflin (Original from the University of Virginia ). p. 123. ISBN 978-0-395-29724-7 . Retrieved November 6, 2011 . 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.

^ John J. Miletich; Tia Laura Lindstrom (2010). An Introduction to the Work of a Medical Examiner: From Death Scene to Autopsy Suite . ABC-CLIO . p. 29. ISBN 978-0275995089 . Retrieved September 15, 2014 .

^ Carroll, Janell L. (2009). Sexuality Now: Embracing Diversity . Cengage Learning. p. 271. ISBN 978-0-495-60274-3 . Retrieved 2010-12-19 .



primary
Bone marrow
Thymus
secondary
Spleen
Lymph node
CNS equivalent
Glymphatic system

Anatomy of the gastrointestinal tract , excluding the mouth
In humans , the anus (from Latin anus meaning "ring", "circle") [1] [2] is the external opening of the rectum , located inside the intergluteal cleft and separated from the genitals by the perineum . Two sphincters control the exit of feces from the body during an act of defecation , which is the primary function of the anus . These are the internal anal sphincter and the external anal sphincter , which are circular muscles that 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 or scrotum .

In part owing to its exposure to feces, a number of medical conditions may affect the anus such as hemorrhoids . [3] The anus is the site of potential infections and other conditions, including cancer (see Anal cancer ). [4]

With anal sex , the anus can play a role in sexuality . Attitudes toward anal sex vary, and it is illegal in some countries. [5] The anus is often considered a taboo part of the body, [5] and is known by many usually vulgar slang terms. Some sexually transmitted infections including HIV/AIDS and anal warts can be spread via anal sex.

The anus is the final part of the gastrointestinal tract , and 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 sphincters , two muscular rings which control defecation. [6] : 397
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 internal anus becomes skin. [6] : 397 The pectinate line is also the division between the internal and external anus.

The anus receives blood from the inferior rectal artery and innervation from the inferior rectal nerves , which branch from the pudendal nerve . [7]

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. [8] : 285

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. 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 sphincters allows the feces to exit from the anus, finally, as the levator ani muscles pull the anus up over the exiting feces.

Anal fissures , which are tears in the external lining of the lining (mucosa) of the anus. These are exquisitely painful, with pain occurring after a motion is passed; other symptoms may include minor bleeding, discharge, or itch. [9] Generally, fissures are due to injury to the mucosa, or because of a poor local blood supply that prevents proper healing, with spasm of the external anal sphincter contributing. [9] The external anal sphincter can be relaxed by the application of glyceryl trinitrate creams, and constipation is managed with laxatives and improving hydration. [9] Some fissures may require botulinum toxin injection; worst cases may require surgical intervention such as "lateral internal anal sphincterotomy or advancement anoplasty" [ clarification needed ] . [9]

Hemorrhoids , which are visible blood vessels from the internal or external venous plexuses of the anus. Haemorrhoids may cause bleeding after passing a motion; may be painful; may cause an itch; may prolapse out of the anus. [9] Haemorrhoids are often associated with straining due to constipation, and pregnancy . [9] Usually, haemorrhoids are managed with medications to make motions more soft and prevent straining during constipation. Some haemorrhoids require surgery to manage, which may involve placing a band around the haemorrhoid , in order for it to lose blood supply; or surgical excision. [9]

Anal abscesses usually result from infection of the normal glands of the anus, or sometimes because of Crohn's disease . [9] They usually occur to the sides of the sphincters, and between the internal and external sphincters, either on the surface, or deeper. 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 [9] and antibiotics. [10] [11]

Itchiness called Pruritus ani , can 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 fissures; poor hygiene or chronic diarrhoea; local infections such as tapeworm and thrush , skin conditions such as psoriasis and contact dermatitis . 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. [9]

Damage or injury to the anal sphincter ( patulous anus in more severe cases) as a result of damage during surgery, such as to the perineal region, or resulting from anal sex ; can lead to flatus and/or fecal incontinence , chronic constipation and megacolon . [13]

A Grade IV hemorrhoid protrudes out of the anus.

The anus has a relatively high concentration of nerve endings and can be an erogenous zone , which 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 . [14]

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 vagina , clitoral legs and anal area for females. This is because of indirect stimulation of the prostate and vagina or clitoral legs. [14] [15] [16] For a male insertive partner, the tightness of the anus can be a source of pleasure via the tactile pressure on the penis. [17] [18] Pleasure from the anus can also be achieved through anal masturbation , fingering , [5] facesitting , anilingus , and other penetrative and non-penetrative acts . 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. [19] Lubricant and condoms are widely regarded as a necessity while performing anal sex as well as a slow and cautious penetration. [20]

Anal intercourse is sometimes referred to as sodomy or buggery , and is considered taboo in a number of legal systems. It has been, and in some jurisdictions continues to be, a crime carrying severe punishment. [5]

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 removal), or 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 is rare because it may interfere with the function of the anus. 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


Medically Reviewed by Dan Brennan, MD on November 30, 2020
Anal sex is any sexual activity that involves the anus. It does not always mean penetration with a penis . People can use sex toys, fingers, or a tongue. People of all sexual orientations and gender identities can have anal sex.
People use many different terms for anal sex, but some common ones include:
Many gay male couples have anal sex, but not all do. Also, people of any sexual orientation or gender can enjoy it, including heterosexual couples.
People without penises can use a sex toy to anally penetrate their partners. Pegging is a term for when a woman does this to a man. 
Myth: There's no chance of getting pregnant from anal sex.
While the chances of getting pregnant from anal sex are certainly lower than with vaginal sex, there is still a small possibility. Any time the penis is close to the vagina , there is always the chance that semen will enter the vagina and lead to pregnancy. 
Myth: It's harder to get sexually transmitted infections from anal sex.
It's just as easy, if not easier, to get sexually transmitted infections (STIs) from anal sex. The tissue of the anus is delicate and can tear easily. This can leave more openings for an infection to enter the body. The person who is getting anally penetrated, sometimes called the bottom, is more at risk for STIs than the person doing the penetrating, sometimes called the top.
You need to relax the sphincter muscle of the anus — the muscle you squeeze when you need to poop but have to wait — to receive anal sex. So it’s important to try to stay relaxed as you explore anal sex by yourself or with a partner. 
Unlike the vagina, the anus does not self-lubricate. You need to use a lot of lubrication, whether you use fingers, a sex toy, or a penis. It will help you avoid tearing or other injury to the area. 
People with penises usually have a prostate gland. This gland has many nerve endings, making the area sensitive. Since the prostate sits on the other side of the rectum, it’s possible to stimulate it by putting a finger or a sex toy inside the anus. Some people with prostates find anal play a pleasurable activity for this reason.
Anal sex may be slightly painful, or it may simply feel strange the first time you try it. Remember, you can always stop any time you want and try again some other time. You can also decide that anal sex is not for you. 
Anal sex may be a higher-risk activity for the spread of STIs. To lower your risk, use a condom when you’re giving or receiving anal sex with a penis. To lower the risk of an STI from oral sex on the anus — sometimes called rimming — use a dental dam . This is a flat piece of latex or polyurethane that goes between the mouth and the anus.
One way to lower your chances of getting HIV from anal sex is to take pre-exposure prophylaxis (PrEP) . This is a prescription medication that, when taken every day, can lower your risk of getting HIV by 99%.
If you end up having unprotected anal sex for any reason, you can also take post-exposure prophylaxis (PEP) within 72 hours of the activity. This is another type of medication that can help prevent HIV after you’ve had sex. However, unlike PrEP — which can be taken daily to prevent HIV — this is an emergency measure only, and you should not use it as a primary form of HIV prevention. 
If you’re having anal and vaginal sex, use a new condom each time you switch from the anus to the vagina. This will lower the chance of infections like urinary tract infections (UTIs) and bacterial vaginosis (BV) . If you’re using fingers or sex toys for anal play, it’s also a good idea to clean them before you use them in the vagina.
Centers for Disease Control and Prevention: "Dental Dam Use."
Centers for Disease Control and Prevention: "PEP (Post-Exposure Prophylaxis)."
Centers for Disease Control and Prevention: "PrEP (Pre-Exposure Prophylaxis)."
National Health Service: "Does anal sex have any risks?"
Office on Women's Health: "Bacterial Vaginosis."
Power Thesaurus: "anal sex/synonyms."
Sex, Etc.: "What is anal sex, and how do you do it? Are there any risks?"
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WebMD does not provide medical advice, diagnosis or treatment.

Medically Reviewed by Carol DerSarkissian, MD on June 23, 2021
Anus Tests Physical examination : A doctor may inspect the outside of the anus, and insert a gloved finger to feel for abnormal areas on the inside of the anus. Sigmoidoscopy : An endoscope (flexible tube with a lighted camera on its tip) is inserted into the anus and moved into the colon. Sigmoidoscopy can only reach part of the colon for viewing. Colonoscopy : An endoscope is inserted into the anus, and the entire colon is viewed to look for problems. Fistulography (fistulogram): A liquid that helps improve image contrast is injected into an abnormal opening in or near the anus, and X-ray films are taken. Fistulography can detect an abnormal connection (fistula) between the anus and skin. Anus Treatments Antibiotics : These may be used to fight infections of the anus caused by bacteria. Antiviral medications : Medicines such as acyclovir (Zovirax), famciclovir (Famvir), and valacyclovir (Valtrex) are used to treat anal infections caused by the herpes viruses HSV-1 and HSV-2. Incision and drainage : Serious skin infections (abscesses) in or around the anus may require this surgical procedure to drain the infected fluid. Anus surgery: Cancer of the anus, anal warts, abscess, or fistula may require surgery to correct the problem. Anal wart treatments : Doctors may use surgery, freezing (cryotherapy), a laser or heat probe, or other treatments to remove warts from the anus. Stool softeners : Constipation may cause hard stools and painful bowel movements. Over-the-counter or prescription stool softeners can relieve these symptoms. Fiber : Increasing fiber in the diet or taking fiber supplements can improve constipation and reduce bleeding from hemorrhoids. Hemorrhoid cream : Over-the-counter or prescription topical medicines can relieve the itching and discomfort caused by hemorrhoids. Hemorrhoid banding : A doctor ties rubber bands around external hemorrhoids, causing the tissue to slowly die and fall off. Hemorrhoid procedures : A doctor may use a laser, heat probe, injections, or other treatment to destroy hemorrhoids and reduce symptoms. Steroid cream: Itching in the anus often responds to over-the-counter creams containing hydrocortisone or a similar steroid medicine.
© 2014 WebMD, LLC. All rights reserved.
The anus is the opening where the gastrointestinal tract ends and exits the body. The anus starts at the bottom of the rectum, the last portion of the colon (large intestine). The anorectal line separates the anus from the rectum.
Tough tissue called fascia surrounds the
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