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Motor control

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This article explores the intricate components of somatic motor control within the sensory system. It outlines the pathway of conscious perception from the primary sensory cortex through the thalamus and central nervous system, to the peripheral nervous system. The discussion encompasses various levels of motor control, from simple spinal reflexes to complex voluntary movements governed by motor association areas in the frontal lobe and the role of the cerebellum. The interactions among lower motor neurons, extrapyramidal nuclei, and feedback mechanisms that modulate movements are also examined.

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Motor control

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  1. Motor control

  2. Components of a Somatic Sensory system Conscious perception of stimuli Provides Neuron in primary sensory cortex Activates Third-order neuron in thalamus Activates Second-order neuron in CNS Activates First-order neuron in PNS Activates Stimulus Detected by receptors

  3. Levels of Somatic Motor Control 1 • Somatic motor control • (involves series of levels) • Simple spinal and cranial reflexes at the base • Complex voluntary motor patterns at the top

  4. 2 Motor association areas Planning stage A B B Conscious decision is Made for specific movements in Frontal lobes Cerebral nuclei Cerebellum • Information is relayed from frontal lobes to motor association areas • These areas relay the information to cerebral nuclei and cerebellum

  5. 3 1 Primary Motor cortex Movement 2 Motor association areas Cerebellum 2 Cerebral Nuclei 3 Lower Motor neurons Other extrapyramidal nuclei • As the movement begins MAA send instructions to PMA • Feedback from CN and Cerebellum modifies those commands • Extrapyramidal motor output directs involuntary adjustment in position and muscle tone Motor activity

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