In this presentation, the author will familiarize the audience with anatomy and structure of muscle with emphasis on morphologic MR imaging of normal muscle, as well as MRI of pathologic conditions of muscle, including trauma and non-traumatic lesions, including inflammatory myositis, infectious myositis, rhabdomyolysis, atrophy with fatty infiltrations due to congenital or denervation atrophy. After this talk, the audience should be able to diagnose different pathologies of muscle on morphologic MRI.