Superior vestibular nucleus

General Information
Latin	nucleus vestibularis superior
Greek
TA98
TA2
FMA
Details
System	Vestibular system
Artery	Anterior inferior cerebellar artery
Vein
Nerve	Vestibulocochlear nerve
Lymphatic drainage
Precursor
Function
Identifiers
Clinical significance
Notes

The superior vestibular nucleus is one of the four major vestibular nuclei located in the brainstem. It plays a crucial role in the processing of vestibular information and is involved in the coordination of eye movements and posture.

Anatomy

The superior vestibular nucleus is situated in the pons, a part of the brainstem. It is located dorsally to the medial vestibular nucleus and is adjacent to the lateral vestibular nucleus. The superior vestibular nucleus is part of the vestibular nuclear complex, which also includes the inferior vestibular nucleus.

Connections

The superior vestibular nucleus receives input from the semicircular canals of the inner ear via the vestibular nerve, a branch of the vestibulocochlear nerve (CN VIII). It also receives input from the cerebellum, particularly the flocculonodular lobe, which is involved in the integration of vestibular information.

The superior vestibular nucleus sends efferent projections to several key areas:

• The oculomotor nucleus and trochlear nucleus, which are involved in the control of eye movements.
• The thalamus, which relays vestibular information to the cerebral cortex.
• The spinal cord, where it influences postural reflexes.

Function

The primary function of the superior vestibular nucleus is to process and integrate sensory information from the vestibular apparatus. This information is crucial for maintaining balance, spatial orientation, and gaze stabilization.

Gaze Stabilization

The superior vestibular nucleus is involved in the vestibulo-ocular reflex (VOR), which stabilizes vision during head movements by producing compensatory eye movements. This reflex is essential for clear vision while the head is in motion.

Postural Control

Through its connections with the spinal cord, the superior vestibular nucleus helps regulate muscle tone and posture, allowing the body to maintain balance and equilibrium.

Clinical Significance

Dysfunction of the superior vestibular nucleus can lead to a variety of clinical symptoms, including vertigo, nystagmus, and balance disorders. Lesions affecting this nucleus may result from stroke, multiple sclerosis, or other neurological conditions.

See Also

• Vestibular system
• Vestibular nuclei
• Vestibulo-ocular reflex
• Balance disorder