rectum
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Key facts
- Anatomy.Name
- Rectum
- Anatomy.part_of
- Large intestine
- Anatomy.system
- Gastrointestinal system
- Anatomy.Latin
- rectum intestinum
- Anatomy.Image
- Rectum anatomy en.svg
- Anatomy.Caption
- Anatomy of the human rectum
- Anatomy.Image2
- Tractus intestinalis rectum.svg
- Anatomy.Caption2
- Scheme of digestive tract, with rectum marked
- Anatomy.Precursor
- Hindgut
- Anatomy.Artery
- Superior rectal artery (first two-thirds of rectum), middle rectal artery (last third of rectum)
- Anatomy.Vein
- Superior rectal veins, middle rectal veins
- Anatomy.Nerve
- Inferior anal nerves, inferior mesenteric ganglia
- Anatomy.Lymph
via Wikipedia infobox
Article
19 sectionsContents
- Structure
- Blood supply and drainage
- Microanatomy
- Function
- Clinical significance
- Examination
- Route of administration
- Constipation
- Inflammation
- Cancer
- Other diseases
- Society and culture
- Sexual stimulation
- History
- Etymology
- See also
- References
- Sources
- External links
The rectum (: rectums or recta) is the final straight portion of the large intestine in humans and some other mammals, and the gut in others. Before expulsion through the anus or cloaca, the rectum stores the feces temporarily. The adult human rectum is about long, and begins at the rectosigmoid junction (the end of the sigmoid colon) at the level of the third sacral vertebra or the sacral promontory depending upon what definition is used. Its diameter is similar to that of the sigmoid colon at its commencement, but it is dilated near its termination, forming the rectal ampulla. It terminates at the level of the anorectal ring (the level of the puborectalis sling) or the dentate line, again depending upon which definition is used. In humans, the rectum is followed by the anal canal, which is about long, before the gastrointestinal tract terminates at the anal verge. The word rectum comes from the Latin rēctum intestīnum, meaning straight intestine.
== Structure ==