Rectum

Jump to: navigation, search

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]


Overview

Rectum
Anorectum.gif
Anatomy of the anus and rectum
Gray1077.png
The posterior aspect of the rectum exposed by removing the lower part of the sacrum and the coccyx.
Gray's subject #249 1183
Artery middle rectal artery, inferior rectal artery
Vein middle rectal veins, inferior rectal veins
Nerve inferior anal nerves, inferior mesenteric ganglia[1]
Lymph internal iliac lymph nodes
Precursor Hindgut
MeSH Rectum
Dorlands/Elsevier r_05/12697487

WikiDoc Resources for

Rectum

Articles

Most recent articles on Rectum

Most cited articles on Rectum

Review articles on Rectum

Articles on Rectum in N Eng J Med, Lancet, BMJ

Media

Powerpoint slides on Rectum

Images of Rectum

Photos of Rectum

Podcasts & MP3s on Rectum

Videos on Rectum

Evidence Based Medicine

Cochrane Collaboration on Rectum

Bandolier on Rectum

TRIP on Rectum

Clinical Trials

Ongoing Trials on Rectum at Clinical Trials.gov

Trial results on Rectum

Clinical Trials on Rectum at Google

Guidelines / Policies / Govt

US National Guidelines Clearinghouse on Rectum

NICE Guidance on Rectum

NHS PRODIGY Guidance

FDA on Rectum

CDC on Rectum

Books

Books on Rectum

News

Rectum in the news

Be alerted to news on Rectum

News trends on Rectum

Commentary

Blogs on Rectum

Definitions

Definitions of Rectum

Patient Resources / Community

Patient resources on Rectum

Discussion groups on Rectum

Patient Handouts on Rectum

Directions to Hospitals Treating Rectum

Risk calculators and risk factors for Rectum

Healthcare Provider Resources

Symptoms of Rectum

Causes & Risk Factors for Rectum

Diagnostic studies for Rectum

Treatment of Rectum

Continuing Medical Education (CME)

CME Programs on Rectum

International

Rectum en Espanol

Rectum en Francais

Business

Rectum in the Marketplace

Patents on Rectum

Experimental / Informatics

List of terms related to Rectum

The rectum (from the Latin rectum intestinum, meaning straight intestine) is the final straight portion of the large intestine in some mammals, and the gut in others, terminating in the anus. The human rectum is about 12 cm long. At its commencement its caliber is similar to that of the sigmoid colon, but near its termination it is dilated, forming the rectal ampulla.

Role in human defecation

The rectum intestinum acts as a temporary storage facility for feces. As the rectal walls expand due to the materials filling it from within, stretch receptors from the nervous system located in the rectal walls stimulate the desire to defecate. If the urge is not acted upon, the material in the rectum is often returned to the colon where more water is absorbed. If defecation is delayed for a prolonged period, constipation and hardened feces results.

When the rectum becomes full the increase in intrarectal pressure forces the walls of the anal canal apart allowing the fecal matter to enter the canal. The rectum shortens as material is forced into the anal canal and peristaltic waves propel the feces out of the rectum. The internal and external sphincter allow the faeces to be passed by muscles pulling the anus up over the exiting faeces.

Medical procedures

For the diagnosis of certain ailments, a rectal exam may be done.

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

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

Temperature taking

Body temperature can also be taken in the rectum. Rectal temperature can be taken by inserting a mercury thermometer for 3 to 5 minutes, or a digital thermometer until it "beeps", not more than 25 mm (1 inch) into the rectum via the anus. Due to recent concerns related to mercury poisoning, the use of mercury thermometers is now discouraged. Normal rectal temperature generally ranges from 36 to 38 °C (97.6 to 100.4 °F) and is about 0.5 °C (1 °F) above oral (mouth) temperature and about 1 °C (2 °F) above axillary (armpit) temperature.

Many pediatricians recommend that parents take infants and toddler's temperature in the rectum for two reasons:

  • (1) Rectal temperature is the closest to core body temperature and in children that young, accuracy is critical.
  • (2) Younger children are unable to cooperate when having their temperature taken by mouth (oral) which is recommended for children, ages 6 and above and for adults.

In recent years, the introduction of ear (tympanic) thermometers and changing attitudes on privacy and modesty have led some parents and doctors to discontinue taking rectal temperatures.

Sexual stimulation

Due to the proximity of the anterior wall of the rectum to the vagina in females or to the prostate in males and the shared nerves thereof, rectal stimulation or penetration can result in sexual arousal. For further information on this aspect, see anal sex.

Additional images

See also

References

  1. Physiology at MCG 6/6ch2/s6ch2_30

External links


ar:مستقيم

cs:Konečník da:Endetarm de:Mastdarmeo:Rektumoio:Rektumo id:Rektum it:Retto he:חלחולת lt:Tiesioji žarna nl:Endeldarmno:Endetarmensimple:Rectum sk:Konečník fi:Peräsuoli sv:Ändtarm


Linked-in.jpg