Transverse images from the dorsolateral pons show PVH axons (red, PHAL) in the pre-locus coeruleus (pre-LC). These confocal montages were spaced 200μm apart and arranged from rostral (A) to caudal (F). Case #2223; see Figures 2 & 3 for injection site. The nuclear core of the LC (TH-immunoreactive neurons, ice-blue) contained minimal axonal labeling. Some varicose axons coursed through its perinuclear dendritic field (peri-LCrm) and the medial edge of the LC. Relative to the pre-LC and PBm, these perinuclear TH-labeled dendrites were not densely targeted, but when examined in individual confocal planes (not shown) some did appear to receive close contacts with PHAL-labeled boutons, consistent with prior electron microscopic observations (Reyes et al., 2005). Scale bar = 100 μm.