Control of Motor Movement Dr.Mohammed Sharique Ahmed Quadri Assistant Professor Department Basic...
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Transcript of Control of Motor Movement Dr.Mohammed Sharique Ahmed Quadri Assistant Professor Department Basic...
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
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
The conceptual hierarchical organization of the neural system controlling body movements
The conceptualmotor controlhierarchy forvoluntary motor movements
Local control of motor neurons
Length monitoring system
Tension monitoring system
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
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
Coactivation of Alpha & Gamma Motor Neurons
Patellar Tendon Reflex( knee jerk)
Patellar Tendon Reflex knee jerk)
Neural pathways underlying Golgi tendon organ component of local control system
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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