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This type of descending motor pathway originates in the brainstem and governs automatic movements that help regulate muscle tone, posture and balance.
The main descending tracts are the lateral vestibulospinal tract from the lateral vestibular nucleus and the medial vestibulospinal tract from the medial vestibular nucleus. The lateral vestibular tract starts in the lateral vestibular nucleus and descends the length of the spinal cord on the same side.igure 11.5 shows details of the lateral vestibulospinal tract. As the name suggests, this tract arises in the lateral vestibular nucleus. The tract descends through the inferior vestibular nucleus, giving this nucleus its salt and pepper appearance.