Fig. 13.     A: Camera lucida drawing from a frontal section at the level of the anterior commissure stained for dopamine-ß-hydroxylase (DBH) fibers/terminals and cholinergic neurons using the nickel enhanced DAB/DAB technique. Only the most proximal portions of dendrites of cholinergic cells are drawn. B: Distribution of PHA-L labeled fibers in relation to cholinergic neurons at the same level as A after PHA-L injection in the locus coeruleus. Note that PHA-L labeled fibers/terminals from locus coeruleus may represent a portion of those found in the DBH/ChAT material. Abbrev. ac = anterior commissure; HDB = horizontal limb of the diagonal band.