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4: Sigmoid colon 5: Rectum Inner diameters of different sections of the large intestine, with transverse colon (at top) measuring on average 5.8 cm (range 5.0-6.5 cm).
The colon (progressing from the ascending colon to the transverse, the descending and finally the sigmoid colon) is the longest portion of the large intestine, and the terms "large intestine" and "colon" are often used interchangeably, but most sources define the large intestine as the combination of the cecum, colon, rectum, and anal canal.
A human colon is considered abnormally enlarged if it has a diameter greater than 12 cm [3] in the cecum (it is usually less than 9 cm [4]), greater than 6.5 cm [3] in the rectosigmoid region and greater than 8 cm [3] for the ascending colon. The transverse colon is usually less than 6 cm in diameter. [4] A megacolon can be either acute or ...
Its main function is to absorb water and salts. The colon is further divided into: Cecum (first portion of the colon) and appendix; Ascending colon (ascending in the back wall of the abdomen) Right colic flexure (flexed portion of the ascending and transverse colon apparent to the liver) Transverse colon (passing below the diaphragm)
Cecum and beginning of ascending colon. The cecum is a pouch marking the division between the small intestine and the large intestine. It lies below the ileocecal valve in the lower right quadrant of the abdomen. [33] The cecum receives chyme from the last part of the small intestine, the ileum, and connects to the ascending colon of the large ...
The colon cut-off sign is a radiographic finding seen on abdominal radiographs and computed tomography scans. It is characterized by a marked dilatation of the transverse colon, with an abrupt transition to collapsed distal colon, particularly the splenic flexure. [1] This sign is indicative of underlying pathology, most commonly acute ...
The descending colon extends from the left colic flexure [2]: 1194 at the upper left part of the abdomen inferior-ward through the left hypochondrium and lumbar regions, along the outer border of the left kidney, [citation needed] ending at the level of the iliac crest [2]: 1194 at the lower left part of the abdomen, [citation needed] being ...
The midgut forms the primary intestinal loop, from which originates the distal duodenum to the entrance of the bile duct. The loop continues to the junction of the proximal two-thirds of the transverse colon with the distal third. At its apex, the primary loop remains temporarily in open connection with the yolk sac through the vitelline duct.