Fig. 3.    Darkfield photomicrographs of PHA-L-labeled fibers in basal forebrain emanating from VTA-SN. Drawings to the right are shown for reference.  A:  Dense innervation from medial VTA into the HDB.  B:  Lateral VTA-medial SN afferents innervating the VP and angular part of the VDB. Scale bars = 500 µm in A, 200 µm in B.