Lecture 21--motor systems

Lecture 21--motor systems - Flexion reflex: when you step...

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Unformatted text preview: Flexion reflex: when you step on a sharp object Error correction Postural adjustments occur before other movements QuickTime ç and a TIFF (Uncompressed) decompressor are needed to see this picture. QuickTime and a TIFF (Uncompressed) decompressor are needed to see this picture. The cerebellum is an “error detector” correcting deviations from the intended motor program: the Cerebellum receives input from sensory areas Cerebellum From spinal cord Touch, spindle, joint receptors vestibular Cerebellum receives input from motor and sensory (but not association) cortex Cerebellum Motor cortex thalamus To spinal cord somatosensory cortex From spinal cord Touch, spindle, joint receptors vestibular Dopaminergic input from substantia nigra Striatum Substantia nigra dopamine Cortico-Striatal-cortical feedback loop Striatum Motor cortex thalamus To spinal cord, cerebellum etc Substantia nigra dopamine Striatum receives input from most cortical areas including massive input from frontal and partietal cortex Striatum Frontal cortex Planning, sequencing behavior Parietal cortex Orientation of body in space Substantia nigra dopamine Rest of cortex Motor cortex thalamus To spinal cord, cerebellum etc Diseases of the striatum (basal ganglia)...
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This note was uploaded on 07/31/2009 for the course BIO 365R taught by Professor Draper during the Spring '08 term at University of Texas.

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Lecture 21--motor systems - Flexion reflex: when you step...

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