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 next portion, or transverse colon, moves across from the right to the left side of the upper abdomen. Next, the 3rd region or descending colon moves down the left side of your abdomen. Then an S shaped or sigmoid colon portion connects the rest of the colon to the rectum which ends at the anus.