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Skeletal Muscles Skeletal Muscles ● ● ● ● ● ● They attach to bones through tendon. Proximal attachment is usually the ORIGIN; the distal attachment is usually the INSERTION Muscles work on bone (levers) to produce movement The muscle must "cross" (act on) a joint to produce movement at that joint. It will have an attachment proximal to the joint and an attachment distal to the joint The direction of the movement produced is determined by the line of pull (LOP) of the muscle and how/where the muscle crosses the joint The farther away from the joint the origin and insertion are, the greater the mechanical advantage is for that muscle Some muscles are divided into parts (anterior, posterior and middle) with each part having different functions because of the different lines of pull These are all concepts that are utilized with exercise and must be considered by the PTA For Example: Instructing a patient in an exercise that does not follow the line of pull will be less effective, and could place additional stress on damaged tissues skel ms file:///C|/Documents%20and%20Settings/marsettt/Desktop/Mics%20saves/Skeletal%20Muscles.htm2/7/2007 3:13:24 PM