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The Pyramidal Tract. This group of fibers carries messages for voluntary motor movement to the lower motor neurons in the brain stem and spinal cord. Approximately 80% of the cell bodies of the pyramidal tract are located on the precentral gyrus of the frontal lobe, which is also known as the motor strip.
Major Somatic Tracts and Pathways. Direct Motor Pathways-provide input to LMNs via axons that extend directly from CEREBRAL CORTEX. Nerve impulses for voluntary movements. Pyramidal Pathways consists of axons that descend from pyramidal cells.(UMNs w/ pyramidal-shaped cell bodies.Indirect Motor pathways-Extrapyramidal Pathways provide input to LMNs form motor centers in the BASAL NUCLEI, CEREBELLUM, CEREBRAL CORTEX.All somatic motor tracts EXCEPT the corticospinal and corticobulbar tracts.ateral Corticospinal Tract. Motor cortex to skeletal muscles on opposite side of body for precise, voluntary movements of distal parts of limbs. -Axons of UMNs descend from precentral gyrus of cortex in MEDULLA. Here 90% decussate and then enter contralateral side of SPINAL CORD to form this tract.