PSYC 2031 Lecture Notes - Lecture 8: Supplementary Motor Area, Primary Motor Cortex, Alpha Motor Neuron

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Action -- the ultimate goal of cognition (charles sherrington: most of the brain is connected to motor areas. The goal nearly all cognitive processes, even perception is to make us ready for action. Premotor and supplementary motor cortex regions action planning/initiation: primary motor cortex action execution. Brainstem execution: spinal cord, contains interneuron, alpha motor neuron, muscle spindle. Some motor neurons in caudal part of primary motor cortex connect directly to upper limb muscles -- an adaptation only in humans and some primates: cortical connections, all cortical motor neurons leave through the cortico-spinal tract (cst) 80% of the connections switch to the opposite of the body. Size of cortical space reflects importance of that area: most of the cst consists of output from primary motor cortex, primary motor cortex neurons initiate specific part of the body, the brain can adapt fast and wisely.

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