Acetylcholinesterase Activity in the Efferent Fibers of the Stato-Acoustic nerve

Abstract

Acetylcholinesterase activity was demonstrated histochemically in the efferent system of the VIIIth nerve. The distribution of the olivocochlear bundle was studied in decalcified temporal bones of cats. In addition to confirming the known course of the bundle, efferent fibers going to the apical and middle turn were seen in the cochlear nerve trunk. Similarly, the pathway of the vestibular efferent system was verified, but more fibers were localized than by previous investigations using other techniques. Selective transection of the efferent system to both divisions of the inner ear resulted in the loss of demonstrable enzyme activity.