This application has been developed for physicians as a medical education tool. It is an interactive anatomical atlas of the upper and lower limb muscles related to Spasticity. One section of the atlas details the muscle system of the upper and lower limbs with different ways to find each muscle (by name or location). As well as identifying where a muscle is located, additional information is provided for each muscle (origin, insertion, action, nerve supply and arterial supply). The second section of the atlas identifies muscles involved in the different forms of Spasticity. This application is for health care professionals only.