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The vestibular nerve is one of the two branches of the vestibulocochlear nerve (the cochlear nerve being the other). In humans the vestibular nerve transmits sensory information from vestibular hair cells located in the two otolith organs (the utricle and the saccule ) and the three semicircular canals via the vestibular ganglion of Scarpa .
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. This nucleus is sometimes termed the nucleus of Schwalbe.
Afferents of the lobe are the vestibulocerebellar fibers arising from either the vestibular nuclei or the vestibular nerve/ganglion directly.. Vestibular organs → vestibular nerve/vestibular ganglion first-order fibers (→ vestibular nuclei (synapse) → second-order fibers) → juxtarestiform body of inferior cerebellar peduncle → (ipsilateral) flocculonodular lobe of cerebellum (synapse ...
The olivocochlear system is a component of the auditory system involved with the descending control of the cochlea.Its nerve fibres, the olivocochlear bundle (OCB), form part of the vestibulocochlear nerve (VIIIth cranial nerve, also known as the auditory-vestibular nerve), and project from the superior olivary complex in the brainstem to the cochlea.
In addition, the vestibular system's function can be affected by tumours on the vestibulocochlear nerve, an infarct in the brain stem or in cortical regions related to the processing of vestibular signals, and cerebellar atrophy. When the vestibular system and the visual system deliver incongruous results, nausea often occurs.
The first and third zones of the flocculus project to the superior vestibular nucleus, the second and fourth zones project to the medial vestibular nucleus, and the fifth zone projects to the interposed posterior nucleus, a part of the cerebellum. [2] The anatomy of the flocculus shows that it is composed of two disjointed lobes or halves.
Also, lesions to the tract impair ascending efferent fiber signaling, which led to nystagmus. [12] [13] There has also been recent research to determine if there is a difference in vestibulospinal function when there is damage to the superior vestibular nerve as opposed to the inferior vestibular nerve and vice versa.
The lateral vestibular nucleus (Deiters's nucleus) is the continuation upward and lateralward of the principal nucleus, and in it terminate many of the ascending branches of the vestibular nerve. Structure