The document discusses various muscle injuries, diseases, and disorders. It describes strains as tears in muscle fibers, cramps as prolonged muscle contractions caused by lactic acid buildup, and bruises as discoloration from blood in injured muscles. Tendinitis is inflammation of tendons, trigger finger causes finger swelling and popping, and gangrene requires cutting off affected tissue. Tumors mainly affect women and develop in the uterus. Myasthenia gravis causes weakness while muscular dystrophy is a genetic weakening of muscles. Treatments include ice, massage, injections, surgery, medication, and avoiding weight gain.

1. Muscular System Muscle Injuries and Diseases

23. 2. Operations