The intestinal tract without the colonic bands, which consists mainly of the duodenum, small intestine, rectum, anal canal, and appendix, is closely related to specific development. The longitudinal muscle of the colon itself is thickened to form the colonic band, which is a three-band structure arranged parallel along the longitudinal axis of the colon, and the three bands converge at the root of the appendix, and the arrangement of the corresponding muscular tissues of the duodenum, small bowel, rectum, anal canal, and appendix is inconsistent with that of the other colons, and does not have the structure of the colonic band, which is formed by the congenital development and is closely related to its own respective functional status. The colonic band is an intrinsic tissue structure of the colon, which helps to distinguish it from other intestinal tubes, especially in the open abdominal exploration, it can be used to determine whether it belongs to the structure of the colon or not, and it can also play a certain role in guiding the positioning of the body surface.