Location of colonic diverticula within the bowel wall

Diverticula develop at four well-defined points around the circumference of the colon, the sites at which the vasa recta penetrate the circular muscle layer. These vessels enter the wall on each side of the mesenteric taenia and on the mesenteric border of the two antimesenteric taeniae. The insets represent the development of a diverticulum at one such point of weakness.