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 s-shaped sigmoid colon begins at the end of the descending colon. The large intestine serves as the largest section of the digestive system. Many health professionals recommend a sigmoidoscopy for men and women over the age of 50. One of the most common causes of cancer death in the US is colon cancer.