Corticospinal Tract (Pyramidal Tract) - The Pathway of Voluntary Movement

The corticospinal tract is the principal descending motor pathway responsible for precise, voluntary movements, particularly of the hands and fingers. It originates from the primary motor cortex, descends through the internal capsule, cerebral peduncles, pons, and medullary pyramids, where nearly 85–90% of fibers cross (decussate) to form the lateral corticospinal tract. It controls skilled movements by activating lower motor neurons in the spinal cord. Damage to this tract produces upper motor neuron signs, including spastic paralysis, hyperreflexia, increased muscle tone and a positive Babinski sign, making it one of the most clinically important motor pathways.