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The medial part of the vestibulospinal tract is the smaller part, and is primarily made of fibers from the medial vestibular nucleus. It projects bilaterally down the spinal cord and triggers the ventral horn of the cervical spinal circuits, particularly controlling lower motor neurons associated with the spinal accessory nerve (CN XI).
The vestibulospinal tract is a nerve tract in the central nervous system. Specifically, it is a component of the extrapyramidal system and is classified as a component of the medial pathway. Like other descending motor pathways, the vestibulospinal fibers of the tract relay information from nuclei to motor neurons. [ 1 ]
The medial vestibular nucleus (Schwalbe nucleus) is one of the vestibular nuclei. It is located in the medulla oblongata . Lateral vestibulo-spinal tract (lateral vestibular nucleus “Deiters”)- via ventrolateral medulla and spinal cord to ventral funiculus (lumbo-sacral segments). ..
Name Location Notes medial vestibular nucleus (dorsal or chief vestibular nucleus) : medulla (floor of fourth ventricle) : corresponding to the lower part of the area acustica in the rhomboid fossa; [citation needed] the caudal end of this nucleus is sometimes termed the descending or spinal vestibular nucleus.
The medial system includes the reticulospinal tract and the vestibulospinal tract, and provides control of posture. The corticospinal tract and the rubrospinal tract belong to the lateral system which provides fine control of movement. [42] Spinal cord tracts - reticulospinal tract labeled in red, near-center at left in figure
reticulospinal tract: connects the reticular system, a diffuse region of gray matter in the brain stem, to the spinal cord. It also contributes to muscle tone and influences autonomic functions. lateral vestibulospinal tract: Connects the brain stem nuclei of the vestibular system with the spinal cord. This allows posture, movement, and balance ...
Medial vestibulospinal tract; Reticulospinal tract; Lateral raphespinal tract; Alpha system; Gamma system; Somatosensory system. Dorsal column–medial lemniscus pathway.
MVN and IVN are in the medulla, LVN and SVN are smaller and in pons. SVN, MVN, and IVN ascend within the medial longitudinal fasciculus. LVN descend the spinal cord within the lateral vestibulospinal tract and ends at the sacrum. MVN also descend the spinal cord, within the medial vestibulospinal tract, ending at lumbar 1. [13] [14]