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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.
For this reason, the condition is known as pseudo-bulbar palsy. If a lesion occurs in the brain stem and damages both the nucleus of a cranial nerve and one side of the upper motor neurons of the pyramidal tract, a condition known as alternating hemiplegia may result.n contrast to the pyramidal tract, the extrapyramidal tract is an indirect, multisynaptic tract. Components of the extrapyramidal tract include the basal ganglia, the red nucleus, the substantia nigra, the reticular formation and the cerebellum. All of these structures send information to the lower motor neurons.