Anatomy and Cell Biology 3319 Chapter : November 21 - Intro to Muscular System.docx

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Intro to muscular system: muscles of head (facial expression, mastication & tongue) Circular: muscles that surround external body openings: close by contracting, circular muscle = sphincter, ex, orbicularis oris (around mouth) and orbicularis oculi (around eyes) Convergent: origin is broad, and the fascicles converge toward the tendon of insertion, can be triangular of fan-shaped, ex, pectoralis major (anterior thorax, muscle fibers extend the length of the muscle, from origin to insertion. Parallel: long axes of fascicles run parallel to the long axis of the muscle, and the muscle fibers extend from origin to insertion, fusiform: extended central belly. Ex, deltoid (shoulder: bipennate: fascicles insert into tendon from both sides. Ex, rectus femoris (thigh: unipennate: fascicles insert into only one side of the tendon. Ex, latissimus dorsi functions in adduction as well as extension of shoulder because it crosses the shoulder both posteriorly and medially. Ex, muscles that fix the scapula when the arm moves.

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