NESC 2470 Lecture Notes - Internal Capsule, Motor Learning, Cerebellum
26 Nov 2012
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Document Summary
Sends axons through internal capsule, down spinal cord, and makes connections with distal muscles (hands, feet) Innervate distal motor units directly: premotor area. Connects primarily with reticulospinal neurons that innervate proximal motor units. Converts what happened signals into how it happened signals. Lies directly in front of central sulcus in parietal lobe. Four ways area 6 studied on its function. Per roland: pet scan, looking at blood flow in brain. Had them tap finger while in scanner. M1, area 6, prefrontal cortex, and areas 5 and 7 light up. Prefrontal, areas 5, 6, 7, not area 4, or m1 light up. Discharges axons over 1 second before movement: side of movement doesn"t affect delay. Control of movement in sma not contralateral. Both sides heavily connected through corpus callosum. Damage to sma interferes with complex motor actions: ex. You can still perform simple motor tasks, but not complex ones. Ready-set-go experiment: pma activity high before pushing button.
