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Motor control Components of a Somatic Sensory system Provides Conscious perception of stimuli 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 1 Levels of Somatic Motor Control Somatic motor control (involves series of levels) •Simple spinal and cranial reflexes at the base •Complex voluntary motor patterns at the top 2 Planning stage Conscious decision is Made for specific movements in Frontal lobes A Motor association areas B B Cerebral nuclei Cerebellum A. Information is relayed from frontal lobes to motor association areas B. These areas relay the information to cerebral nuclei and cerebellum 3 1 Primary Motor cortex Movement Motor association areas 2 2 Cerebellum Cerebral Nuclei 3 Other extrapyramidal nuclei 1. 2. 3. 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 Lower Motor neurons Motor activity