PHAL-labeled axons traveling through the ventral tegmental area display very few branches and boutons (Fig. 6S) and follow median and lateral pathways to reach the pons. Small numbers of PHAL-labeled axons course medially from the ventral tegmental area though the interfascicular and central linear nuclei of the raphe (Fig. 6S,T) to end in the dorsal nucleus of the raphe (Fig. 6U). Collator note: Atlas level 38, Swanson 1998. Fibers of passage are present. Figure 6S from the paper.

Most PHAL-labeled fibers in the ventral tegmental area travel caudolaterally through an area between the medial lemniscus and substantia nigra (Fig. 6S), then the retrorubral area, and then dorsolateral mesencephalic reticular nucleus, to arrive in the ventrolateral division of the periaqueductal gray (Fig. 6T,U). Collator note: Atlas level 41, Swanson 1998. Figure 6T from paper.