File:Diseases of the ear - a text-book for practitioners and students of medicine (1900) (14579464320).jpg

Identifier: diseartex00denc (find matches)
Title: Diseases of the ear : a text-book for practitioners and students of medicine
Year: 1900 (1900s)
Authors: Dench, Edward Bradford, 1864-1936
Subjects: Ear
Publisher: New York : D. Appleton and Company
Contributing Library: Yale University, Cushing/Whitney Medical Library
Digitizing Sponsor: Open Knowledge Commons and Yale University, Cushing/Whitney Medical Library

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stiga-tions. The Vestibular Nerve.—The vestibular nerve arises fromthe internal or dorsal nucleus, close to the vagus centre, butsuperficial to this. Branches originating in this collection ofnerve cells cross the raphe, embracing in their course thenucleus of the sixth nerve and pass to the cerebral cortex,although the exact course which they follow is undetermined.A large fasciculus extends to the cerebellum, passing firstthrough the pons, then the vermis, and finally terminates inthe corresponding cerebellar hemisphere and in that of theopposite side. The dorsal nucleus communicates with thespinal cord through a fasciculus which passes downward andinward between the olivary bodies. Besides the cochlear and vestibular roots, the auditorytrunk contains a bundle of fibres which emerge between theroots already described. These arise from an aggregation ofcells, called Deiterss cells, lying in the medulla between theanterior nucleus and the olivary body. The branches of com- PLATE IV.
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lar The Auditory Nerve. (Modified from Freud.) THE AUDITORY NERVE. ^j munication with the other nuclei of the eighth nerve and withother cerebral centres are undetermined. We thus appreciate the complexity of the central portionof the acoustic apparatus, and may realize what manifoldcauses may exist for impairment or perversion of function.We must bear in mind that any disturbance of audition ofnervous origin may be variously located at any point betweenthe cochlea, which represents the end organ of the auditorynerve, and the first and second temporal convolutions of thecerebrum, which represent the cortical auditory area. Thefibres from the cochlea of either side, according to our descrip-tion, pass through the cochlear nerve to the ventral nucleusand to the tuberculum acusticum, most of the fibres passingto the superior olive of the opposite side through the corporatrapezoides, and then to the corresponding posterior quadri-geminal body through the iillet; thence to the posterior th

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