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XXI. The Importance of the Vestibular Mechanism in Neurology

The otic labyrinth is of great interest and important neurologically, as it is the terminal end organ of an extensive sensory mechanism which has connections with· many portions of the central nervous system. This mechanism is frequently involved in affections of the nervous system-organic, functional and psychic-and when the seat of pathologic disturbances, produces symptoms which are essentially neurologic in character-e. g., vertigo-subjective and objective; disturbances of static consciousness and equilibrium; nystagmus, and forced movements due to an alteration of the labyrinthine tonus of the muscles of the trunk and extremities. A knowledge of the functions and relations of the vestibular nerve is, therefore, essential to a proper understanding of vertigo, equilibrium and orientation, nystagmus, and cerebellar localization.