ANSC 2340 Chapter Notes - Chapter 8: Myocyte, Epimysium, Aponeurosis
4 Mar 2017
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Volunteer striated muscle: old name for skeletal muscle. However, not all skeletal muscle movement is voluntary. Epimysium: a fibrous connective sheath that surrounds the muscle cells. Belly: a thick central portion of skeletal muscles. Usually connects muscles to bones at each ends. Connect muscles to bones or to other muscle. Ex) linea alba or the white line that connects the abdominal muscles from each side. Origin of the muscle: more stable site of attachment that does not move much. Insertion of the muscle: the site that undergoes the most movement during contraction. Muscle contraction = pulling two attachment sites together, shorten the muscle. Agonist: a muscle/muscle group that directly produces a desired movement. Antagonist: a muscle/muscle group that directly opposes the action of an agonist. Synergist: contract at the same time as an agonist and assists movement. Fixator: stabilize joints to allow other movements to take place. Very long (can be several inches), but very thin.
