BILATERAL REPRESENTATION OF THE HORIZONTAL SEMICIRCULAR CANALS IN THE INFERIOR VESTIBULAR NUCLEUS OF CATS.
Abstract
The existence of bilateral representation was demonstrated in single units in the inferior vestibular nucleus of decerebrate, decerebellate cats by recording the spike potentials with tungsten microelectrodes. Recording electrodes one to two microns in diameter were stereotaxically placed in the inferior vestibular nucleus. Recordings were made from locations where the frequency of action potentials was affected by the direction of acceleratory stimulation of the horizontal semicircular canals. The ipsilateral and contralateral eighth cranial nerves were stimulated individually by one second galvanic pulses. The individual spike potentials were amplified and recorded on moving film from the screen of a cathode ray oscilloscope. Response to electrical stimulation was demonstrated by changes in the impulse rate at the recording site. Responses were elicited by stimulation of the nerves of both sides in almost all observations. The effect of stimulation of the contralateral side was, however, usually lesser in degree than the effect in the ipsilateral side. Other effects of stimulation were also noted. The possibility that responses were due to current spread from the site of stimulation was eliminated by demonstrating the lack of response in the sectioned nerve. Electrode placements were determined histologically. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1965
- Accession Number
- AD0624663
Entities
People
- John Thomas La Croix
Organizations
- Texas A&M University