Through which tracts do vestibulospinal signals reach the spinal cord?

• A. The corticospinal tracts
• B. The spinothalamic tracts
• C. The vestibulospinal tracts (lateral VST for posture, medial VST for head/neck stabilization)
• D. The dorsal column-medial lemniscus

Answer: (C)

Vestibular information reaches the spinal cord mainly through the vestibulospinal pathways. These tracts carry signals from the vestibular nuclei in the brainstem down into the spinal cord to influence motor neurons involved in posture and head stabilization. The lateral vestibulospinal tract originates from the lateral vestibular nucleus and descends mainly ipsilaterally to facilitate extensor muscles, helping keep the body upright and balanced. The medial vestibulospinal tract comes from the medial vestibular nucleus and travels bilaterally to cervical and upper thoracic levels, primarily coordinating head and neck position to stabilize gaze and true head orientation. This route is distinct from other major motor and sensory pathways—corticospinal tracts handle voluntary movement, spinothalamic tracts carry pain and temperature, and the dorsal column-medial lemniscus handles fine touch and proprioception.