A 45-year-old man develops progressive ataxic gait, dysarthria, and nystagmus. MRI shows atrophy of the anterior vermis. Which tract is primarily responsible for relaying proprioceptive input from the lower limb to the cerebellum via this vermal pathway?

• A Dorsal (posterior) spinocerebellar tract ✓
• B Ventral (anterior) spinocerebellar tract
• C Cuneocerebellar tract
• D Olivocerebellar tract

Explanation

The dorsal spinocerebellar tract (Clarke's column, C8–L3) carries unconscious proprioception from muscle spindles and Golgi tendon organs of the ipsilateral lower limb and enters the cerebellum via the inferior cerebellar peduncle to terminate in the anterior and posterior vermis. The ventral spinocerebellar tract crosses twice (back to ipsilateral) and enters via the superior peduncle, conveying information about the state of interneuronal networks. The cuneocerebellar tract carries upper limb proprioception. The olivocerebellar tract brings error-correction signals from the inferior olive via climbing fibers.

Reference: BD Chaurasia's Human Anatomy, 8th ed.

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Written and medically reviewed by the StethoPrep medical team.