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Other Terms: Colon transversum, Côlon transverse
The transverse colon is the longest and most movable portion of the large intestine. It passes from the right hypochondriac region through the lower part of the epigastric and the upper part of the umbilical to the left hypochondriac region. Here it approaches the spleen, and turns downward as the left colic flexure, to become the descending colon. The left colic flexure is situated higher than the right colic flexure, being under the costal margin. In the epigastric and umbilical regions, the transverse colon lies just below the greater curvature of the stomach. It makes a long curve, the convexity of which is directed downward and forward. The greater omentum is suspended from its lower border. Relations - Above it are the liver, the gall-bladder, the stomach, and the lower extremity of the spleen. Below are the greater omentum and the small intestine. Behind are the transverse mesocolon, the descending colon, and the transverse portion of the duodenum. In front are the greater omentum and the anterior abdominal wall. It is entirely surrounded by peritoneum, and is attached to the posterior wall of the abdominal cavity by the transverse mesocolon. The mobility of this part of the colon permits fecal accumulations to carry it downward.