| Bundles of muscle from the teniae coli penetrate the circular layer at irregular intervals. |
| These sites lie always between the mesenteric tenia and the two antimesenteric teniae, so that the diverticula form rows along the lateral surfaces of the organ. |
| Contraction of the teniae coli exerts pressure on the wall and creates a series of pouches, called haustra, along the colon. |
| The longitudinal muscle layer continues between the teniae as a thin but complete coat. |
