Polygons are 2-dimensional shapes. They are made of straight lines, and the shape is closed (all the lines connect up).
Rectopexy is a surgical procedure used to correct rectal prolapse, a condition characterized by a weakening of the muscles that hold the rectum in place. Though the exact cause of this problem is unknown, there are several conditions that may contribute to its development.
atrophic excavation cupping of the optic disk, due to atrophy of the optic nerve fibers. dental excavation removal of carious material from a tooth in preparation for filling. rectouterine excavation a sac formed by a fold of peritoneum dipping down between the uterus and rectum. rectovesical excavation the space between the rectum and bladder in the peritoneal cavity of the male. vesicouterine excavation the space between the bladder and uterus in the peritoneal cavity of the female.