Effects of aging on the architecture of the ileocecal junction in rats

Figure 1 Histological sections of the ileocecal junctions in the young group and the elderly group. Hematoxylin-eosin staining (A-D) was performed to examine the ileum (IL), cecum (C), circular muscle layer (CM) and longitudinal muscle layer (ML). Picrosirius staining under non-polarized light (E and G) showed the transition region between the ileum (IL) and cecum (C). Picrosirius staining under polarized light (F and H) showed type I collagen fibers (yellow, orange and red) (arrows) and type III collagen fibers (green) (arrowhead).