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Control of Motor Movement

بسم الله الرحمن الرحيم. Control of Motor Movement. Dr.Mohammed Sharique Ahmed Quadri Assistant Professor Department Basic Medical Sciences Division of Physiology Faculty of Medicine Almaarefa Colleges. Control of Motor Movement. 3 levels of input control motor-neuron output

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Control of Motor Movement

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  1. بسم الله الرحمن الرحيم Control of Motor Movement Dr.MohammedSharique Ahmed Quadri Assistant Professor Department Basic Medical Sciences Division of Physiology Faculty of Medicine Almaarefa Colleges

  2. Control of Motor Movement • 3 levels of input control motor-neuron output • Input from afferent neurons • Input from primary motor cortex • Input from brain stem

  3. The conceptual hierarchical organization of the neural system controlling body movements

  4. The conceptualmotor controlhierarchy forvoluntary motor movements

  5. Local control of motor neurons

  6. Length monitoring system Tension monitoring system

  7. Muscle Spindle Structure • Consist of collections of specialized muscle fibers known as intrafusal fibers • Lie within spindle-shaped connective tissue capsules parallel to extrafusal fibers • Each spindle has its own private efferent and afferent nerve supply • Play key role in stretch reflex

  8. Stretch Reflex • Primary purpose is to resist tendency for passive stretch of extensor muscles by gravitational forces when person is standing upright • Classic example is patellar tendon, or knee-jerk reflex

  9. Coactivation of Alpha & Gamma Motor Neurons

  10. Patellar Tendon Reflex( knee jerk)

  11. Patellar Tendon Reflex knee jerk)

  12. Neural pathways underlying Golgi tendon organ component of local control system

  13. References • Human physiology by Lauralee Sherwood, 7th edition • Text book physiology by Guyton &Hall,12th edition • Text book of physiology by Linda .s contanzo,third edition

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