Medically reviewed by Amy Kwan, PT Your latissimus dorsi (your "lats") is a broad, flat, triangle-shaped muscle that spans ...

For example, in your arm, your biceps and triceps are antagonistic ... such as the stomach lining. Skeletal muscle is joined to bones. Its cells contract to make bones move and joints bend.

Acute injury, overuse (wear and tear), and underlying conditions affecting arm bones, muscles, joints, tendons, or other connective tissues can cause pain and discomfort anywhere from your ...