using a retrograde tracer technique with microiontophoretically applied horseradish peroxidase ( hrp ) , afferent projections to the brain stem raphe nuclei ( br , raphe magnus , pallidus and obscurus ) and to two adjacent reticular nuclei , nucleus reticularis pontis caudalis ( nrpc ) and nucleus gigantocellularis ( ngc ) were identified .
C0006121
brain stem
C0034671
raphe