16LowerMotorControl-2

16LowerMotorControl-2 - Motor Control Four subsystems are...

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Unformatted text preview: Motor Control Four subsystems are responsible for motor control 1. Grey matter of spinal cord Alpha/lower motor neurons Innervate muscle fibers Form final common pathway for motor behavior Interneurons (local circuit neurons) Major source of input into motor neurons Targeted by sensory neurons and descending projections from higher centers Important in coordination Figure 16.1 Overall organization of neural structures that control movement 2. Cortical and Brainstem - link thought and action Upper cortical neurons Originate from brainstem and cerebral cortex (frontal lobes, precentral gyrus) Synapse w/interneurons and/or alpha neurons Integrate sensory information to regulate reflex activity of lower motor neurons Planning, initiating and directing voluntary movements 3. Cerebellum - correction of movement based on sensory feedback 4. Basal ganglia - gating of proper initiation of movement Figure 16.1 Overall organization of neural structures that control movement Figure 16.1 Overall organization of neural structures that control movement Topography of Motor Neuron-Muscle Relationships Motor Neuron Pools Bunches of neurons that innervate a given muscle (e.g. biceps) Grouped together in rod-shaped arrangement coursing through several spinal segments in ventral horn Figure 16.2 Spatial distribution of lower motor neurons in the ventral horn of the spinal cord Motor neuron pools for different...
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This note was uploaded on 11/09/2011 for the course CHEM 2341 taught by Professor Staff during the Fall '11 term at Texas State.

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16LowerMotorControl-2 - Motor Control Four subsystems are...

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