Fig. 1.     A-F: Series of drawings made from coronal sections through a rat brain (rostral to caudal) that have been immunostained for ChAT (choline acetyltransferase), illustrating the distribution of cholinergic neurons (dots). Striatal cholinergic neurons (including those in the ventral striatum) have been omitted for simplicity. Abbrev. ac = anterior commissure; Acb = accumbens nucleus; BL = basolateral amygdaloid nucleus; BSt = bed nucleus of the stria terminalis; CA = central amygdaloid nucleus; CP = caudate putamen; DM = dorsomedial hypothalamic nucleus; f = fornix; GP = globus pallidus; HDB = horizontal limb of the diagonal band; ic = internal capsule; LSd = lateral septal nucleus, dorsal; LSi = lateral septal nucleus, intermediate; LV = lateral ven-tricle; MCP = magnocellular preoptic nucleus; MS = medial septal nucleus; ot = optic tract; Rt = reticular thalamic nucleus; SI = sublenticular substantia innominata; sm = stria medullaris; VDB = vertical limb diagonal band nucleus; VM = ventromedial hypothalalamic nucleus; VP = ventral pallidum.