intussuscipiens

Almost all intussusceptions occur with the intussusceptum having been located proximally to the intussuscipiens.

The intussuscipiens includes rectal lumen distal to the intussusceptum only).

The part that prolapses into the other is called the intussusceptum, and the part that receives it is called the intussuscipiens.

From the lumen outwards, the first layer is the proximal wall of the intussusceptum, the middle is the wall of the intussusceptum folded back on its self, and the outer is the distal rectal wall, the intussuscipiens.