PSY 250 Lecture Notes - Lecture 10: Classical Conditioning, Basal Ganglia, Muscle Tone
22 Mar 2016
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Outputs: interacts with diferent levels of corical motor circuit. Only 10% of mass of the brain but contains over 50% of the brain s neurons. Has two hemispheres with 3 pairs of deep nuclei. Involved in iming, ine0tuing motor responses, and motor learning. May also do the same for cogniive responses: pyramidal motor system: m1 sends signals to motor neurons in the spinal cord through various pathways (called coricospinal tracts) Betz cells: long motor neurons projecing to leg muscles; descend through the medullary pyramids, then cross sides; also involved in of wrist, hands, ingers, and toes. Coricorubrospinal: synapse at the red nucleus and cross before the medulla; some control muscles of the face, distal muscles of the legs. Axons branch and innervate interneuron circuits bilaterally in muliple spinal segments; ipsilateral projecion. Corico-brainstem-spinal: interacts with various brainstem structures and descends bilaterally. Synapse on interneurons of muliple spinal segments controlling proximal trunk and muscles.
