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

Figure 4 Transmission electron microscopy. A: A cross-section of the muscle layer showing the muscle fibers (*) and connective tissue (arrow) of the young group. Magnification: × 6000; B: A longitudinal section of the muscle layer showing muscle fibers (*), nuclei (N) and a set of unmyelinated fibers (arrows) of the young group Magnification: × 20000; C: A longitudinal section of the muscular layer showing collagen fibers arranged in different directions (arrows) and muscle fibers of the elderly group. Magnification: × 10000; D: Nucleus (N) and collagen fibers arranged in different directions (arrows) and synaptic vesicles (arrowhead) of the elderly group. Magnification: × 10000.