Figure 2.

Section of the colon that demonstrates the inner muscular layer ending abruptly (arrow). The outer muscular layer is split, the inner portion wrapping around the blunt end of the inner muscular layer. Myenteric (Auerbach’s) plexus is visible between this portion of the outer muscular layer and the abruptly terminating inner muscular layer. The outer portion of the outer muscular layer continues, becoming attenuated and finally ending. The muscularis mucosa, immediately below the lamina propria containing normal colonic glands, is present throughout (Hematoxylin and Eosin, 20×).