Motor Functions and Control of Movement

Motor Functions and Control of Movement - movements,...

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Motor Functions and Control of Movement All muscular contractions are controlled by motor signals generated (but not originate) in the spinal cord Closed loop system of voluntary muscle control and movement 1. Local feedback Local sensory signals directly cause a motor signal Low level of hierarchy Immediate influence on the movement 2. Central feedback Processing of somatic sensory information by brain to influence descending motor signals High level of hierarchy Delay in signal processing 3. Feedback by other modalities Use of afferent information from vision and other modalities to influence descending motor signals Provides most accurate control Delay in signal processing Open loop system of muscle control and movement Afferent inputs elicit a movement that cannot be controlled by the brain (examples include reflex-evoked
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Unformatted text preview: movements, withdrawal from noxious stimuli) Major neural structures involved in movement (7) • Cerebral cortex, basal ganglia, thalamus, cerebellum, brain stem, spinal cord, muscle • Signals from brain stem originate from a variety of nuclei, including many from the core of gray matter – reticular formation • Most of the descending cortical signals affect spinal cord indirectly though relays in brain stem, some travel all the way to the anterior horn cells in the spinal cord • Basal ganglia and cerebellum have prominent projections to thalamus and to premotor and motor areas of the cerebral cortex...
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This note was uploaded on 04/23/2011 for the course BIME 2102 taught by Professor Kim during the Spring '11 term at UVA.

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