Anatomy and Cell Biology 3319 Chapter Notes -Quadrilateral, Genioglossus, Parietal Bone
3 Mar 2014
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Document Summary
Introduction to the muscular system: muscles of the. Circular: concentric ring arrangement, surround external body openings, close openings by contracting, general name: sphincter (squeezer, ex. orbicularis oris muscle around mouth & orbicularis oculi around eyes. Convergent: origin is broad, fascicles converge toward the tendon of insertion, triangle or fan-shaped, muscle fibres extend the length of muscle from origin to insertion, ex. pectoralis major muscle in anterior thorax. Muscle attachments: prime mover, major action (agonist, antagonist, muscle which opposes action, synergist, muscle that assists prime mover. Face: obicularis oculi, palprebal, orbital, corrugator supercilii, levator labi superioris, zygomaticus, major, minor, risorius, orbicularis oris, depressor labii inferioris, depressor angui oris, mentalis, buccinator. Bell"s palsy: facial nerve is most commonly damaged cranial nerve, bell"s palsy is the most common cause of acute facial paralysis, usually only involves one side, condition can be transient with no known cause, patients usually fully recover. I skin of eyebrows & root of nose.
