Segmentated intestine (colon)
Segmentated intestine (colon) surrounds the loop of the small intestine and is divided into ascending, transverse, descending and sigmoid.
|In Fig. 171.
Colon, skinny and ileum
1 - caul;
2 - transverse colon;
3 - free band of the colon;
4 - mesentery of the transverse colon;
5 - jejunum;
6 - ascending colon;
7 - cecum;
8 - the sigmoid colon;
9 - ileum
|In Fig. 172.
Transverse colon colon
1 - haustrum;
2 - tape stuffing;
3 - packing processes;
4 - free band of the colon;
5 - crescent-shaped folds of the colon;
6 - mesenteric tape
Ascending colon (colon ascendens) is an extension of the blind . Its posterior surface is not covered by peritoneum and is located on the rear wall of the abdomen on the right. Its length varies from 12 (with a high position cecum) to 20 cm on the front surface is a free band of the colon (taenia libera), the posteromedial - stuffing band (taenia omentalis) and not covered by peritoneum posterolateral - mesenteric band (taenia mesocolica). In the transition to the transverse colon forms a right bend of the colon (flexura coli dextra).
Transverse colon (colon transversum) begins in the right upper quadrant at the level of X rib cartilage. Its left and right sections are superficial ascending and descending colon intestines. This is the longest section (50 cm), which has its own mesentery (mesocolon transversum) that attach to the mesenteric tape of the transverse colon. On the front surface of the packing tape passes along the colon-intestinal ligament (lig. gastrocolicum). Dropping a bunch of passes in the caul (omentum majus), which covers the transverse colon in front. Left bend of the colon (flexura coli sinistra) is located in the left upper quadrant, right lower and deeper. In the transition to the descending colon forms an acute angle, a fixed diaphragm, colon, intestinal ligament (lig. phrenicocolicum).
Descending colon (colon descendens) is located on the rear wall of the abdomen on the left. Its length is 22 cm and the diameter decreases as it approaches the sigmoid colon.
Sigmoid colon (colon sigmoideum) lies in the left iliac fossa, descends into the pelvic cavity and passes into the rectum at the level III sacral vertebra. On average, its length is 55 cm, but there may be considerable individual variations. Sigmoid colon forms two loops, one of which lies on the iliacus , and the other - on a large psoas muscle . The value of the sigmoid loop depends on the length of the root of the mesentery of the sigmoid colon (mesocolon sigmoideum).
a., aa. — arteria, arteriae (artery, the artery)
lig., ligg. — ligamentum, ligamenta (ligament, the ligaments)
m., mm. — musculus, musculi (muscle, the muscle)
n., nn. — nervus, nervi (nerve, the nerve)
r., rr. — ramus, rami (branch)
s. — seu (or)
v., vv. — vena, venae (vienna)