Fig. 8.     Arborization of PHA-L labeled axons in the basal forebrain following the tracer injection into the locus coeruleus. A: Asterisk marks the location of picture in (B). B: Note that the majority of axon varicosities may contact non-cholinergic elements; however, a few of them are located adjacent to a cholinergic corticopetal neuron (arrowheads). CP, caudate putamen; f, fornix; GP: globus pallidus; HD, horizontal limb of the diagonal band; ic, internal capsule; MP, magnocellular preoptic nucleus; SI, substantia innominata; vhc, ventral hippocampal commissure. Scale: 10 µm.