Synonyms for Corticospinal Tract (same or very similar meaning)
WordNet sense 1 (any of the important motor nerves on each side of the central nervous system that run from the sensorimotor areas of the cortex through the brainstem to motor neurons of the cranial nerve nuclei and the ventral horn of the spinal cord):
pyramidal tract, pyramidal motor systemFrom the ODE community, based on WordNetadd/edit