3. (Aeronautics) any structure corresponding to or resembling the keel of a ship, such as the central member along the bottom of an aircraft fuselage. 4. (Biology) biology a ridgelike part; carina. 5. a poetic word for ship.
Transverse colon and sigmoid colon. The transverse colon and the sigmoid colon have a mesentery (ie, transverse mesocolon and sigmoid mesocolon, respectively), but the ascending colon and descending colon are retroperitoneal, while the cecum is intraperitoneal but uses the mesentery of the ileum.
The colon is essentially a tube, about five feet long, that connects the small intestine to the anus. It receives undigested food and secretions from the small intestine and converts these to solid feces by absorbing almost all the fluid that enters it.The part of the colon lying in the left side of the abdominal cavity bends into a loop. Because of its shape, it is called the sigmoid colon.hese are sometimes referred to as tortuous or redundant colons. These twisted colons may pose a challenge for the person doing a colonoscopy. (It may be hard to traverse the organ to its full length.) But colons like these have no health implications.