Uninjured and CTX-injected tibialis anterior muscle specimens were obtained from mice sacrificed at days 2, 3, 5, and 12 following muscle injury. These samples were flash frozen, sectioned, stained with H&E, and visualized by light microscopy. The myofibers underwent extensive destruction followed by regeneration; with the exception of persistent internalization of myonuclei, muscle regeneration is virtually complete by day 12 after muscle injury.