Motor-1 - MOTOR CONTROL B & L Chapter 9, pp 157-174 Motor...

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MOTOR CONTROL B & L Chapter 9, pp 157-174
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Motor control: need to think about what the muscles are doing, rather than about the goal of the movement Not intuitive Motor system or motor hierarchy, begin at the lowest level BUT all structures work together in movement 2 functions: coordination, posture
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Mechanical basis of coordination: most movement occurs at joints, 2 bones come together muscles contract and pull to get full range of motion around joint, must have at least one muscle attached on each side of a joint As muscles work there are changes in joint angle and in muscle length
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FLEX: decrease joint angle; flexor contracts and shortens extensor is stretched and lengthens EXTEND: increase joint angle; extensor contracts and shortens flexor is stretched and lengthens Definitions: muscles Agonist: “actor” Antagonist: muscle with opposite action at the joint Synergists: all muscles with the same action at a joint
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definitions: posture=resisting forces of gravity Antigravity muscles: extensors Their antagonists: flexors Postural fixation: elimination of unwanted movement at a joint, necessary for useful movement
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muscle + CNS components of the motor system “motor hierarchy” All structures work together, consider them one at a time muscle
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different muscles in the body vary in properties: 1. Force 2. Resistance to fatigue 3. Speed of contraction 4. Fineness of control (small changes in force, joint angle) Properties 1,2,3, result from structure and 4 both from structure and pattern of innervation of muscle.
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Structure of muscle: the muscle fiber or cell 2 different kinds: fast twitch, slow twitch Fast twitch: FF fibers (Fast Twitch fibers): fast, fatigable, large force, fast contraction time, fatigue readily (white muscle) FR fibers: also fast, more resistant to fatigue, also large force
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This note was uploaded on 02/22/2011 for the course PGY 451 taught by Professor Baizer during the Spring '09 term at SUNY Buffalo.

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Motor-1 - MOTOR CONTROL B & L Chapter 9, pp 157-174 Motor...

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