Distribution of the Crossed Olivo-Cochlear Bundle Terminals in the Squirrel Monkey Cochlea

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Abstract
Distribution of the crossed olivo-cochlear bundle terminals in the squirrel monkey cochlea was studied electron microscopically after transection of the bundle at the floor of the fourth ventricle. About 70 % of the inner spiral bundle belongs to the crossed olivocochlear bundle at the lower basal turns. About 90 % of all efferent endings to the outer hair cells belong to the crossed olivo-cochlear bundle within the lower basal turns. The innervation percentage of the crossed olivocochlear bundle is relatively reduced within the upper turns. After studying the serial transverse sections of the brain stem, it was found that all of the midline sections extended well beyond the edge of the facial genu both rostrally and caudally.