CORTICAL PROJECTION OF VESTIBULAR AND FACIAL NERVES IN CAT

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Abstract
The projection of the vestibular nerve to the cerebral cortex has been mapped in the cat by a modification of the evoked potential technic. In addition to the 1st and 2d auditory receiving areas, brief (0.2 to 1 msec.) single shock stimulation of the intact 8th cranial nerve causes activation of the anterior descending limb of the suprasyl-vian gyrus of either cerebral hemisphere. When the vestibular nerve is isolated by previous ablation of the cochlear ganglion and section of the facial nerve, the vestibulo-cortical projection is found to be centered in the anterior descending limb of the suprasylvian gyrus. Under deep barbiturate narcosis the latency of these evoked surface positive waves is 10 to 12 msec. No cortical projection of possible afferent fibers of the facial nerve to this area could be demonstrated although a projection from the nervus intermedius was not excluded.

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