Anatomy
pyramidal tract
py·ram·i·dal tract
Subclass of:
Efferent Pathways; Spinal Cord
Definitions related to pyramidal tracts:
  • Nerve fibers which originate in the cerebral cortex, pass through the medullary pyramid, and terminate in the motor brain stem and spinal cord; mediate direct cortical control and initiation of skilled movements.
    CRISP Thesaurus
    National Institutes of Health, 2006
  • Tract of brain, each instance of which is a collection of some corticospinal and cortibulbar nerve fibers that crossover at the level of the pyramids in some medulla oblongata; it is a collection of some upper motor neuron fibers which go to some spinal cord (corticospinal) or some brainstem (corticobulbar) and control the motor function of some body.
    Foundational Model of Anatomy
    University of Washington, 2017
  • Fibers that arise from cells within the cerebral cortex, pass through the medullary pyramid, and descend in the spinal cord. Many authorities say the pyramidal tracts include both the corticospinal and corticobulbar tracts.
    NLM Medical Subject Headings
    U.S. National Library of Medicine, 2025
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