control of motor movement dr.mohammed sharique ahmed quadri assistant professor department basic...
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Control of Motor Movement
Dr.Mohammed Sharique Ahmed QuadriAssistant Professor
Department Basic Medical Sciences Division of Physiology Faculty of Medicine Almaarefa Colleges
بسم الله الرحمن الرحيم
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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
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The conceptual hierarchical organization of the neural system controlling body movements
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The conceptualmotor controlhierarchy forvoluntary motor movements
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Local control of motor neurons
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Length monitoring system
Tension monitoring system
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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
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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
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Coactivation of Alpha & Gamma Motor Neurons
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Patellar Tendon Reflex( knee jerk)
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Patellar Tendon Reflex knee jerk)
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Neural pathways underlying Golgi tendon organ component of local control system
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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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