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Proximal end of a limb is stationary, distal end moves in a circle combination of a flexion, extension, abduction, and adduction
Hold a bone still or stabilize the origin of a prime mover so all the tension can be used to move the insertion bone; eg. postural muscles that stabilize the vertebrae
Direction of the muscle fibers
Usually a reference to midline or long axis of a limb (rectus, oblique, transverse)
Location of muscle's origin and insertion
Sternocleidomastoid (originates on sternum and clavicle, inserts on mastoid process of temporal bone)
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