Fig. 1.    Computer-assisted reconstruction of Phaseolus vulgaris leucoagglutinin (PHA-L) filled perikarya in the ventral mesencephalon of 4 representative cases, showing injection sites in progressively more lateral parts of the VTA-SN. Three anterior-posterior levels are shown from left to right for each case. 93128: PHA-L deposit in medial part of the VTA. 93047: Labeled cells are distributed in the lateral half of the VTA and the most medial component of the SNC. See also Fig. 2A. 93049: Injection in the central part of the SN, covering both pars compacta and reticularis. See also Fig. 2B. 93051: PHA-L-labeled cells in the lateral part of the SNC and SNR.