The physiological anatomy of the colon

Including colon cecum, ascending colon, transverse colon, descending colon and sigmoid colon, about 130cm, about one-fourth of the small intestine. Short small intestine and colon than the rough, cecal diameter 7.5cm, to the distal gradually become smaller in diameter at the end of the sigmoid colon is only 2.5cm. The main functions of the colon is to absorb water and electrolytes, formation and storage of manure excretion. Water and sodium absorption mainly in the right colon, sigmoid colon and also on giving some of the moisture absorption, but mainly for manure storage and discharge. As a result, in a timely manner if defecation, stool in the colon stay too long in the feces of water will be absorbed by the dry hardened feces, cause difficulties in defecation. In addition, the colon has the function of potassium secretion, which in the stool potassium concentration than the small intestine contents of potassium concentration. The length of the human colon is about 100 centimeters (ascending colon 15cm, transverse colon 50cm, descending colon 20cm, sigmoid colon 45cm, so the colon is about 130cm), the colon can 2000c.c isotonic mass chyme, into 200c . c semi-solid manure, water and 9 into the colon to be absorbed. People often say that the colon is the large intestine, is divided into three parts, for the first part of the colon or, in the lower right back to the Department of blind people began to line it up that section of the colon; liver to body parallel to the left-hand music course called the transverse colon to the left Qu spleen side of the body down and then called the descending colon. The lower end of its connection sigmoid colon, rectum, anus. Including colon cecum, ascending colon, transverse colon, descending colon and sigmoid colon, about 130cm, about one-fourth of the small intestine. Short small intestine and colon than the rough, cecal diameter 7.5cm, to the distal gradually become smaller in diameter at the end of the sigmoid colon is only 2.5cm. The anatomy of the colon there are three characteristics: ① with colon: vertical wall of the muscle fibers to form a narrow 3 of the longitudinal belt. In the cecum with colon, transverse colon and ascending colon have a better idea, down from the sigmoid colon to gradually obvious. ② colon bag: As the colon with more than one-sixth of the short attached to the colon, the colon wall and therefore a number of Su Cheng cystic bags, said bags of the colon. ③ intestinal fat down: by the wall under the mucous membrane of adipose tissue by clustering. In the colon wall, especially in the vicinity of the colon with a majority of intestinal fat down, more in the sigmoid colon and Di. Intestinal fat down the outside of the package for the peritoneum, and sometimes contains too much fat can reverse occurred, or even into enteral caused intussusception.