Transverse folds of rectum

From Infogalactic: the planetary knowledge core
Jump to: navigation, search
Transverse folds of rectum
File:Gray1078.png
Coronal section of rectum and anal canal.
Anorectum.gif
Anatomy of the anus and rectum
Details
Latin Plicae transversae recti
Identifiers
Dorlands
/Elsevier
p_24/12649311
TA Lua error in Module:Wikidata at line 744: attempt to index field 'wikibase' (a nil value).
TH {{#property:P1694}}
TE {{#property:P1693}}
FMA {{#property:P1402}}
Anatomical terminology
[[[d:Lua error in Module:Wikidata at line 863: attempt to index field 'wikibase' (a nil value).|edit on Wikidata]]]

The transverse folds of rectum (or Houston's valves) are semi-lunar transverse folds of the rectal wall that protrude into the rectum, not the anal canal as that lies below the rectum. Their use seems to be to support the weight of fecal matter, and prevent its urging toward the anus, which would produce a strong urge to defecate. Although the term rectum means straight, these transverse folds overlap each other during the empty state of the intestine to such an extent that, as Houston remarked, they require considerable maneuvering to conduct an instrument along the canal, as often occurs in sigmoidoscopy and colonoscopy.

These folds are about 12 mm. in width and are composed of the circular muscle coat of the rectum. They are usually three in number; sometimes a fourth is found, and occasionally only two are present.

  • One is situated near the commencement of the rectum, on the right side.
  • A second extends inward from the left side of the tube, opposite the middle of the sacrum.
  • A third, the largest and most constant, projects backward from the forepart of the rectum, opposite the fundus of the urinary bladder.
  • When a fourth is present, it is situated nearly 2.5 cm above the anus on the left and posterior wall of the tube.

Transverse folds were first described by a British anatomist John Houston, a curator of Dublin College of Surgeon's Museum, in 1830. They appear to be peculiar to human physiology: Baur (1863) looked for Houston's valves in a number of mammals, including wolf, bear, rhinoceros, and several Old World primates, but didn't find any. They are formed very early during human development, and may be visible in embryos of as little as 55 mm in length (10 weeks of gestational age.)[1]

External links

  • Lua error in package.lua at line 80: module 'strict' not found.
  • pelvis at The Anatomy Lesson by Wesley Norman (Georgetown University) (rectum)

References

This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)

  1. Lua error in package.lua at line 80: module 'strict' not found.


<templatestyles src="Asbox/styles.css"></templatestyles>