Anatomy and Cell Biology 3319 Lecture Notes - Lecture 20: Facial Nerve, Maxilla, Trigeminal Nerve
13 Dec 2016
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Know the attachments (origins and insertions), actions and innervation of the 12 major muscles of facial expression. Know the attachments (origin/insertion), actions and innervation of the 4 muscles of mastication (masseter, temporalis, lateral and medial pterygoid) Describe the extrinsic (genioglossus, hyoglossus, styloglossus) muscles of the tongue. There are more than 700 muscles in the body, and they come in a variety of shapes and sizes related to function. Arrangement of fascicles: circular sphincters, lips, eyes. Dilator: arranged radially around the sphincter muscle to de- contract it: convergent broad origin/origination, and then fibers converge at the insertion. Strap-like: muscle fibres run from one end to another. Muscle terminology: origin fixed attachment. Insertion attachment which moves with contraction: prime mover major action (agonist, agonist, antagonist muscle which opposes action, synergist muscle that assists the action; 2 muscles that work together to perform one action. Names of muscles always tell you something about their action, location, or characteristics.
