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.