Abstract

The central projections of the lagenar branchof the cochleolagenar nerve of the pigeon were studied by the Fink-Heimer method in transverse, horizontal and sagittal sections of the brain stem. In addition to terminating within specialized areas associated with the cochlear nuclei, primary lagenar neurons distribute to a limited region of the ventral part of the lateral vestibular nucleus, the dorsolateral portion of the descending vestibular nucleus, the quadrangular division of the superior vestibular nucleus, and the medial vestibular nucleus. Direct lagenar projections are also traceable to the external cuneate nucleus and the processus lateralis cerebello-vestibularis. The gigantocellular (dorsal) division of the lateral vestibular nucleus, interstitial nucleus and tangential nucleus are free of terminal degeneration following extirpation of the lagenar ganglion.

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