Direct projections from the anterior pretectal nucleus to the dorsal accessory olive in the cat: an anterograde and retrograde WGA-HRP study.

Direct projections from the anterior pretectal nucleus (APN) to the dorsal accessory olive (DAO) were found in the cat by the anterograde and retrograde WGA-HRP methods. The dorsal or the ventral portions of the rostral half of the APN pars compacta send fibers respectively to the lateral or the medial portions of the whole rostrocaudal extent of the DAO. These APN-DAO fibers can be considered to play roles in some somatomotor mechanisms.