CMD 377 Lecture Notes - Lecture 17: Supplementary Motor Area, Postcentral Gyrus, Primary Motor Cortex

• School: URI
• Department: Communicative Disorders
• Course: CMD 377
• Professor: Mikyong Kim

Document Summary

Cmd 377 - lecture 17 - the motor system: corticobulbar and corticospinal systems. Send discrete, fine movement information to muscles. Multiple synapses along the way before final destination. Sends information to muscles that provide basic support. Somatosensory cortex of the postcentral gyrus input. Supplementary motor area rest of . Direct projection from pyramidal cells (motor neurons) in the motor areas of the cortex to the spinal cord. About 85% of fibers that decussate in the caudal. Motor area posterior limb of internal capsule fibers decussate in the caudal medulla (pyramidal decussation) terminate in the ventral horn of the spinal cord or in the brainstem reticular formation. Usually the part of the corticospinal tract that people are referring to. Remaining 15-20% of the corticospinal fibers that do not decussate. Descend to the spinal cord and terminate on motor or interneurons of the ventral horn.