KINE 3020 Lecture Notes - Lecture 6: Muscle Contraction, Supplementary Motor Area, Alpha Motor Neuron
8 Feb 2016
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Decision: prefrontal cortex decision making / choose the goal to sma & pma. Plan: sma & pma motor plan creation / menu. Execution: (primary) motor cortex motor plan execution force & direction. Body parts that require more detailed motor control are larger: size principle. Primary motor cortex (m1: 1) first mapped by dr. wilder penfield at montreal neurological institute. Used electrical stimulation in awake patients undergoing brain surgery. Movement of the patients" bodies revealed motor cortex map: 2) tms (transcranial magnetic stimulation) M1 neurons are directly attached to the motor neurons / interneurons: ppc (posterior parietal cortex) Proprioception & vision: s1 (primary somatosensory cortex) Need a plan first s1 & ppc correct / modify / guide while the movement is undergoing: thalamus. Adjust the movement (basal ganglia preferentially encode context dependent choice) Cerebellum: motor coordination & learning a motor skill. Motor control system involves multiple levels: cortical levels, subcortical levels, spinal cord levels. At the same time parallel system.
