The taeniae coli (also teniae coli or tenia coli) are three separate longitudinal ribbons (taeniae meaning ribbon in latin) of smooth muscle on the outside of the ascending, transverse, descending and sigmoid colons. They are visible and can be seen just below the serosa or fibrosa. There are three teniae coli: mesocolic, free and omental taeniae coli. The teniae coli contract lengthwise to produce the haustra, the bulges in the colon.

Teniae coli
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Iliac colon, sigmoid or pelvic colon, and rectum seen from the front, after removal of pubic bones and bladder. (Tænia coli not labeled, but visible at center.)
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Female pelvis and its contents, seen from above and in front. (Taenia coli not labeled, but visible at right.)
Details
Identifiers
LatinTaeniae coli
TAA05.7.03.013
FMA76487
Anatomical terminology
Large bowel (sigmoid colon) with multiple diverticula. These appear on either side of the longitudinal muscle bundle (taenium).


The bands converge at the root of the vermiform appendix. At the rectosigmoid junction, the taeniae spread out and unite to form the longitudinal muscle layer. These bands correspond to the outer layer of the muscularis externa, in other portions of the digestive tract.

The teniae coli are regulated by the sacral nerves of the spinal cord, which are under control of the parasympathetic nervous system.[1]


DiverticulosisEdit

Main article: Diverticulosis

Spaces between the circular bands of taeniae are weak points in the bowel, and are the sites of diverticulosis. Most diverticulosis occur in the sigmoid colon as it is the segment with the highest intraluminal pressure. Diverticulosis does not occur in the rectum as the tinea coli become a continuous muscular layer. Diverticulosis can then become diverticulitis if the patient develops inflammation of the diverticulosis, this whole spectrum of disease is called diverticular disease.



ReferencesEdit

  1. ^ Lambert, H. Wayne; Wineski, Lawrence E. (2011). Anatomy & Embryology. Lippincott Williams & Wilkins. p. 65. Destruction of the sacral spinal cord will eliminate parasympathetic outflow to the hindgut, pelvic organs, and perineum as well as somatic innervation to much of the pelvis and lower limbs. Because it stimulates gut motility and tone, loss of parasympathetic input will result in relaxation and inactivity of the teniæ coli in the descending colon.

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