Rectum

Rectum
	Anatomy of the anus and rectum
	Posterior aspect of rectum apparent by removing lower allotment of sacrum and coccyx
Gray's	subject #249 1183
Artery	superior belly artery (first two-thirds of rectum), middle belly artery (last third of rectum)
Vein	superior belly veins, middle belly veins
Nerve	inferior anal nerves, inferior mesenteric ganglia
Lymph	inferior mesenteric lymph nodes, pararectal lymph nodes, internal iliac lymph nodes
Precursor	Hindgut
MeSH	Rectum

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"Rectal" redirects here. For the avenue of administration, see Rectal (medicine).

For the cone-shaped sections see Latus rectum or Semi-latus rectum

The rectum (from the Latin rectum intestinum, acceptation straight intestine) is the final beeline allocation of the large intestine in some mammals, and the gut in others, absolute in the anus. The animal rectum is about 12 cm long.^{citation needed} Its ability is agnate to that of the sigmoid colon at its commencement, but it is aggrandized abreast its termination, basic the rectal ampulla.

Role in animal defecation

The rectum intestinum acts as a acting accumulator website for feces. As the belly walls aggrandize due to the abstracts bushing it from within, amplitude receptors from the nervous system amid in the belly walls activate the admiration to defecate. If the appetite is not acted upon, the actual in the rectum is about alternate to the colon area added baptize is absorbed. If defecation is delayed for a abiding period, constipation and accustomed carrion results.^{citation needed}

When the rectum becomes full, the access in intrarectal burden armament the walls of the anal canal apart, acceptance the begrimed amount to access the canal. The rectum shortens as actual is affected into the anal aqueduct and peristaltic waves actuate the carrion out of the rectum. The centralized and alien sphincter acquiesce the carrion to be anesthetized by analysis affairs the anus up over the departure feces.

Supports of rectum

Pelvic attic formed by levator ani muscles.
Fascia of Waldeyer
Lateral ligaments of rectum which are formed by the abstract of pelvic fascia
Rectovesical fascia of Denonvillers, which extends from rectum abaft to the seminal vesicles and prostate in front.
Pelvic peritoneum
Perineal body

Medical procedures

For the analysis of assertive ailments, a rectal exam may be done.

Suppositories may be amid into the rectum as a route of administration for medicine.

The endoscopic procedures colonoscopy and sigmoidoscopy are performed to analyze diseases such as cancer.

Digital Belly Stimulation, the admittance of one feel into the rectum, is acclimated to abet peristalsis in patients whose own peristaltic reflex is bare to absolutely abandoned the rectum.

Manual Evacuation is the use of a gloved feel to abandon faeces from the rectum, and is utilised primarily in astute ache and aswell the abiding administering of neurogenic bowel, apparent a lot of frequently in humans with a spinal bond injury or multiple sclerosis.

Temperature taking

Body temperature can aswell be taken in the rectum. Belly temperature can be taken by inserting a medical thermometer not added than 25 mm (1 inch) into the rectum via the anus. A mercury thermometer should be amid for 3 to 5 minutes; a agenda thermometer should abide amid until it beeps. Due to contempo apropos accompanying to mercury poisoning, the use of mercury thermometers is outlawed. Normal belly temperature about ranges from 36 to 38 °C (97.6 to 100.4 °F) and is about 0.5 °C (1 °F) aloft articulate (mouth) temperature and about 1 °C (2 °F) aloft axilla (armpit) temperature.^{citation needed}

Many^who? pediatricians acclaim that parents yield infants' and toddlers' temperature in the rectum for two reasons:

Rectal temperature is the abutting to amount physique temperature and in adolescent children, accurateness is critical.
Younger accouchement are clumsy to abet if accepting their temperature taken by aperture (oral), which is recommended for accouchement ages 6 and aloft as able-bodied as adults.

In contempo years, the addition of tympanic (ear) thermometers and alteration attitudes on privacy and modesty accept led some parents and doctors to abandon demography belly temperatures.^{citation needed}

Sexual stimulation

Due to the adjacency of the antecedent bank of the rectum to the vagina in females or to the prostate in males and the aggregate fretfulness thereof, belly stimulation or assimilation can aftereffect in sexual arousal. For added advice on this aspect, see anal sex.