Figure 1. Histological cross-sections of the superficial (A) and deep (B) regions of tibialis anterior muscle, four months after periodic muscle injuries. Signs of regenerated muscle fibers are identified by the presence of centralized nuclei (arrowheads) and split fibers (arrows). Note large spaces among the muscle fibers in the deep region of the muscle (B). Also, the signs of previous muscle injury are more abundant in the deep region of the muscle (B) when compared to the superficial region (A). N = normal fibers. Toluidine blue stain. Bar: 42 µm.