Ultrastructural organization of endings of the efferent fibers of zones A1 and A4 of the auditory cortex of the cat in the superior olivary complex

: Distribution of synapses formed by straight corticofugal fibers running from the zone A1 and A4 of the acoustic cortex in the main basilar nuclei of the cat superior olive has been studied electron microscopically. These synapses are presented as axodendritic structures situating on processes of small and middle diameters, predominantly at the side of the operation (both in the medial and lateral complexes). Problems on functional influence of the acoustic cortex projections on subcortical acoustic centers depending on the form and amount of the synaptic terminals are discussed.