KNES 385 Lecture Notes - Lecture 23: Prefrontal Cortex, Basal Ganglia, Motor Planning
27 Nov 2018
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Right index finger flexion: somatosensory and motor cortexes both activated. More complex: tapping with hands in sequence: sma, inferior prefrontal cortex, sma: if movement requires a complex sequence. Thinking about a movement but not doing it: sma can still be active. Extremely active: activates very fast before movement. Unclear if the coarse (rough) surface of the cortex is associated with difference body parts gradients that overlap. Lack of precision in motor cortex allows the cortex to be more adaptable to the movement needs. Loose organization: more combinations of body parts to be activated in a precise sequence, increased movement flexibility. Late research: stimulation of cortex resulted in activation of multiple muscles: moving in different direction means different muscles are being used, specific cortical area being stimulated all movements go to same place (different muscles being used) Pma/sma synapse to motor cortex and brainstem local alpha motor neurons in cord. Synapse with: pm area, sma, motor cortex.
