Which tract is responsible for voluntary refined movements of distal extremities?

• A. Rubrospinal Tract
• B. Spinothalamic Tract
• C. Corticospinal Tract
• D. Fasciculus Gracilis

Answer: (C)

Voluntary refined movements of the distal extremities are mediated mainly by the corticospinal tract. This pathway carries motor commands from the cerebral cortex down to the spinal cord, with most fibers crossing in the medullary pyramids to form the lateral corticospinal tract. The lateral corticospinal fibers innervate spinal motor neurons and interneurons that control distal muscles, enabling fine, fractionated movements of the hands and fingers.

Other tracts don’t provide the same level of precise distal control: the rubrospinal tract contributes more to gross arm movements and posture; the spinothalamic tract is sensory (pain, temperature, crude touch); the fasciculus gracilis carries fine touch and proprioception from the lower body.