KINE 2P09 Lecture Notes - Lecture 9: Primary Motor Cortex, Premotor Cortex, Sensory Cortex
17 Oct 2017
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Document Summary
Contains over half of the neurons in the brain. Divided into 3 regions: spinocerebellum <> brainstem/spinal cord > motor execution, cerebroceebellum <> motor cortex > motor planning, vestibulocerebellum <> vestibular system > balance. Acts as a comparator (ref. of correctness) during movement: compares motor plan (desired state) to sensory feedback (actual state, allows for automatic adjustments to ongoing movement. Involved in co-ordination of movement: programs temporal properties of movement (e. g. , onset time and duration of muscle activity. Unlike the cerebral cortex, which works on a contralateral basis (opposite sides), the cerebellum works ipsilateral (same side) Ataxia: movement is not coordinated, jerky and inaccurate. Dysmetria: errors in range and direction of movement, ex. Unable to bring finger to nose: errors in direction and range. Dysdiadochokinesia: errors in rate and regularity of movement observed as an irregular pattern when performing alternating movements. Supplementary motor cortex or area (sma) (located more medial)
