The noises commonly associated with flatulence are caused by the vibration of the anal sphincter, and occasionally by the closed buttocks.

Third-degree laceration, anal sphincter damage, and emergency caesarean section are more common in FGM women than in controls.

A physician measures the latency between squeeze and contraction by observing the anal sphincter or by feeling it with a gloved finger inserted past the anus.

Fetal distress during labor causes intestinal contractions, as well as relaxation of the anal sphincter, which allows meconium to pass into the amniotic fluid and contaminate the amniotic fluid.

Rather, Pujol was able to " inhale " or move air into his rectum and then control the release of that air with his anal sphincter muscles.

In season 7, episode 5 of Penn & Teller's Showtime series Bullshit !, it was claimed and appeared to have been demonstrated that polygraphs can be confused or beaten by tightening up one's anal sphincter.

Doug Williams, a former Oklahoma City police polygraph examiner, explained that many large arteries exist around the anal sphincter and that by tightening the muscles, the arteries will constrict, raising one's blood pressure, and registering a lie.

It was then demonstrated by having a woman hooked up to a polygraph, having her write a number from 1-10 on a piece of paper ( she chose 7 ), deny that she chose each number as asked by the examiner but tighten up her anal sphincter on the number 6.

A sufficient increase in fecal material in the rectum causes stretch receptors from the nervous system located in the rectal walls to trigger the contraction of rectal muscles, relaxation of the internal anal sphincter and an initial contraction of the skeletal muscle of the external sphincter.

The relaxation of the internal anal sphincter causes a signal to be sent to the brain indicating an urge to defecate.

The perineal wall is lowered causing the ano rectal angle to decrease from 90 degrees to less than 15 degrees ( almost straight ) and the external anal sphincter relaxes.

Once this has been achieved, loss of control causing fecal incontinence may be caused by physical injury – such as damage to the anal sphincter that may result from an episiotomy, intense fright, excessive pressure placed upon the abdomen, inflammatory bowel disease, impaired water absorption in the colon ( diarrhea ), and psychological or neurological factors.

They are primarily worn for a short period of time to prepare the anus for anal sex, stretching and relaxing the sphincter muscles to comfortably accept a penis or other penetrative device.

In order to get them into the rectum, they most commonly have a general profile of a round-ended cone which then narrows to a " waist " which locates itself at the anal sphincter, with the flared part outside the body, preventing the butt plug from slipping further into the body.

Rectal examination gives an impression of the anal sphincter tone and whether the lower rectum contains any feces or not.

The anal canal can be defined functionally as the distance between the anorectal ring and the end of the internal anal sphincter.

The internal anal sphincter forms the walls of the anal canal.

The internal anal sphincter is not under voluntary control, and in normal persons it is contracted at all times except when there is a need to defecate.

This means that the internal anal sphincter contributes more to the resting tone of the anal canal than the external anal sphincter.

Fecal incontinence can be caused by injury to one or both of the ring-like muscles at the end of the rectum called the internal and external anal sphincters.

Myology # The muscles of the anal region

Tears can involve the perineal skin or extend to the muscles and the anal sphincter and anus.

A noxious or tactile stimulus will cause a wink contraction of the anal sphincter muscles and also flexion.

The liquid is secreted via paired anal subcutaneous glands that are connected to the body through striated muscles.

The practice may be pleasurable because of the large number of nerve endings in the anal area, and because of the added stimulation gained from stretching the anal sphincter muscles while inserting the finger.

The anal glands of males are also lined with detachable hairs.

Opossums are particularly important as reservoirs, because the parasite can complete its life cycle in the anal glands of the animal without having to re-enter the insect vector.

The dorsal and anal fins are divided into anterior spiny and posterior soft-rayed portions, which may be partially or completely separated.

Because of this, they are slow-moving and rely on their pectoral, dorsal, anal, and caudal fins for propulsion rather than by body undulation.

The Molidae are conspicuous even within this oddball order: they lack swim bladders and spines, and are propelled by their very tall dorsal and anal fins.

* Cancers and Genital dysplasia-" high-risk " HPV types are associated with cancers, ( cervical cancer and can also cause some vulvar, vaginal, penile, anal and some oropharyngeal cancers.

In many countries, lesbians, gays, bisexual, transgender ( LGBT ) youth, and those with other sexual orientations or practices, are often ignored in sex education classes, including a frequent lack of discussion about safer sex practices for manual, oral, and anal sex with regards to the different risk levels for contracting sexually transmitted diseases.

Directly beside or behind this lie two pairs of special glands, which probably serve an auxiliary reproductive function ; the rearmost glands are also known as anal glands.

The first dorsal and anal fins are spinous, as is the operculum.

Family members are distinguished by having at least three anal spines.

They are generally medium sized fish, and are distinguished by the presence of three dorsal fins on the back and two anal fins on the underside.

The anal fin usually has two spines while the dorsal fins are deeply notched or separate.

Their venomous spines are on both dorsal fins, the pectoral fins, pelvic fins, anal fins, and several on the gill cover.

The word bugger and buggery are still commonly used in modern English as a mild exclamation, and " buggery " is also synonymous with anal sex.

When " playing possum ", the animal's lips are drawn back, the teeth are bared, saliva foams around the mouth, the eyes close or half-close, and a foul-smelling fluid is secreted from the anal glands.

In snakes, feet and claws are absent, but in many boids such as Boa constrictor, remnants of highly reduced hind-limbs emerge with a single claw as " spurs " on each side of the anal opening.

They have two long barbels, which are as long again as the body in front of the anal fin.

Colonics are inappropriate for people with bowel, rectal or anal pathologies where the pathology contributes to the risk of bowel perforation.

In males, these anal spurs are larger and more conspicuous than in females.