The exact borders of vestibular nerve projections in the temporal cortex of cat were investigated under chloralose-nembutal and chloralose anesthetics. The caudal border of the vestibular area coincided with the anterior ectosylvian gyrus. The focus of evoked potentials was located in the anterior suprasylvian sulcus or 1-2 mm rostrally. Short-latency potentials recorded in the temporal region caudally to the indicate border were due to current propagation and excitation of the cochlear structures. According to the data obtained the second vestibular area in the temporal cortex is absent. Vestibular projections are mostly contralateral (latency 5.2 +/- 0.7 ms). Ipsilateral responses have longer latency (8.4 +/- 1.3 ms) and their amplitude depends on the type of anesthetic. It is suggested that the ipsilateral vestibulocortical pathway includes one or more additional synaptic junctions.
Afferent Pathways Animals