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Unformatted text preview: and frequently a single muscle contributes to the production of two or more movements. 2. Antagonist - muscles that oppose one another upon contraction - biceps and triceps. Antagonists are located on opposite sides of a joint. 3. Fixators/stabilizers - muscles that immobrhze a bone or joint near the origin of the prime mover so that the prime mover can act more efficiently. II. Structure of Skeletal Muscle '*:pss,'An#omv g .1 '1i. . I Tendons are extensions of connective tissue membranes beyond the end of the muscle. Origin - less movable end of a muscle, usually proximal.--:r Insertion - more movable end of a muscle, usually distal. Belll- - widest portion of a muscle, between its origin and insertion. $elfmuscles insert on bone. Most of the muscles controlling facial expression originate from bone and insert in the skin....
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- Fall '09