Accession Number : AD0667572

Title :   THE ACTIVITY OF AFFERENT NERVE FIBERS FROM THE VESTIBULAR ORGAN AND OF NEURONS IN THE VESTIBULAR NUCLEI OF UNANESTHETIZED PRIMATES.

Descriptive Note : Interim rept.,

Corporate Author : PITTSBURGH UNIV PA DEPT OF PHARMACOLOGY

Personal Author(s) : Werner,Gerhard ; Whitsel,Barry L.

Report Date : 01 MAR 1968

Pagination or Media Count : 27

Abstract : The activity in afferent fibers entering the brain stem from the vestibular organs shows that the frequency of nerve impulses reflects with extraordinary precision the magnitude of the shearing force acting on one of the sensory surfaces in the vestibular organ which respond to gravitational forces (i.e.: the maculae utriculi and sacculi). On the other hand, the neurons of the vestibular nuclei receive convergent neural input from several of these sensory surfaces, both ipsi - and contralateral to the recording site. In awake animal preparations, the discharge frequency of individual neurons undergoes large periodic fluctuations which are correlated with eye movements. These periodic fluctuations are absent in anesthetized preparations, or after surgical removal of the cerebellum. Contrary to current views, this new data attribute to the vestibular nuclei the role of a central synapse in a motor reflex pathway, rather than that of sensory relay nuclei. (Author)

Descriptors :   (*VESTIBULAR APPARATUS, NERVE FIBERS), NERVE CELLS, NERVE IMPULSES, ELECTROPHYSIOLOGY, PRIMATES, NERVES, NYSTAGMUS, REFLEXES

Subject Categories : Anatomy and Physiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE