Which of the following is NOT a tract involved in the extrapyramidal system?

• A. Rubrospinal tract
• B. Vestibular tract
• C. Reticulospinal tract
• D. Tectospinal tract

Answer: (B)

The vestibular tract is not classified as part of the extrapyramidal system. The extrapyramidal system is primarily involved in the modulation of motor activity and is responsible for the coordination of involuntary movements, balance, and posture, relying on several specific pathways in the brain.

The other tracts mentioned play significant roles within the extrapyramidal system. The rubrospinal tract is involved in the control of motor functions, particularly for the upper limbs. The reticulospinal tract contributes to the regulation of tone and reflexes, while the tectospinal tract is essential for head and eye coordination in response to visual stimuli. Each of these tracts works in concert to facilitate the integration of motor control beyond the direct voluntary pathways managed by the pyramidal system.