PMID: 8592199Nov 1, 1995Paper

Neuronal activity in the ipsilateral vestibular nucleus following unilateral labyrinthectomy in the alert guinea pig

Journal of Neurophysiology
L RisE Godaux

Abstract

1. Neuronal activity was investigated in the left superior vestibular nucleus (SVN), lateral vestibular nucleus (LVN), and rostral part of the medial vestibular nucleus (MVN) in the alert guinea pig after a unilateral (left) labyrinthectomy was performed. Vestibular neurons were recorded either immediately (just-postoperative group, n = 6) or 1 wk after labyrinthectomy (1-wk-postoperative group, n = 6) and compared with the activity recorded in intact animals (control group, n = 6). 2. Animals were prepared for extracellular recording of single-unit activity and for eye movement recording (scleral search coil technique). To enable stimulation of the left vestibular nerve, bipolar silver ball electrodes were chronically implanted either in contact with the bony labyrinth in the control group or close to the stump of the vestibular nerve after labyrinthectomy. Complete labyrinthectomy was performed under halothane anesthesia. 3. The criterion used to select vestibular neurons for analysis was their recruitment by an electric shock on the vestibular nerve. Of the 589 recorded neurons, 424, defined as second-order vestibular neurons, were recruited at monosynaptic latencies (0.85-1.15 ms) and 165 were recruited at polysynaptic late...Continue Reading

Citations

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