ACB 8120 Lecture Notes - Lecture 56: Upper Motor Neuron, Lower Motor Neuron, Cranial Nerve Nucleus
12 Apr 2020
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Document Summary
Motor control translating electrical impulses from neurons into coordinated and integrated physical movements in the outside world requires a unified process which can be broken down into most essential components. Lower neurons have to be activated to move the muscles. Lower motor neurons are controlled by cortical and subcortical motor centers via direct and indirect corticospinal pathways (respectively) Cortical control centers have modifying influences from the basal nuclei/ganglia and cerebellum via relays through the thalamus va and vl nuclei respectively. Motivational movement: prefrontal/supplementary motor area (frontal area) Visually triggered movement - visual association areas (occipital lobe) Initiating new programs and introducing changes in programs in progress. New motor program/change in motor program based on sensory input premotor area precentral gyrus. Primary motor cortex upper motor neurons. Pathways from the cortex (upper motor neurons) Axon descends in ipsilateral internal capsule, cerebral peduncle, pons, and decussating in the pyramids of the medulla no.
