Pyramidal tract function and the clinical "pyramidal syndrome".
In this review, I wish to reconcile clinical usage of terminology and experimental concepts of pyramidal tract function. The traditional view, based essentially on neurological observations in stroke patients, was that this tract provides the structural basis of volitional movements. This concept is too simple and understanding of pyramidal tract function needs a considerably larger perspective. The view is discussed that the pyramidal tract is composed of subsystems with different cortical origin, fibre terminations and fibre sizes. The system shares its motor control function with other descending pathways and it also contributes to the phenomenon of descending control of sensory inflow. The pyramidal system plays a special role in the control of digital skill and speed of movements. However, there are also somewhat neglected observations that point to its function in postural control.
D000328:Adult; D000818:Animals; D000882:Haplorhini; D006801:Humans; D008297:Male; D009068:Movement; D009462:Neurology / Q000639:trends; D011712:Pyramidal Tracts / Q000502:physiology*; D013118:Spinal Cord Diseases / Q000473:pathology / Q000503:physiopathology*; D013577:Syndrome