Fig. 8.     DBH-positive terminal contacts a dendrite of a cholinergic neuron located in the caudal part of the substantia innominata.  A:  Low magnification electron micrograph with two dendritic segments. Box in lower left is enlarged (D). B:  Light microscopic view of the neuron. (Note that part of this neuron is depicted in the color micrograph of Fig. 6C). Asterisks (B,C) mark the cell body. Arrowhead points to the DBH varicosity identified in (D).  C:  Low magnification view of the section under the electron microscope. Boxed area is enlarged (A).  D:  Enlarged view of the synapse. The DBH-positive bouton is densely labeled. Arrows denote postsynaptic density. Note the prominent subsynaptic dense bodies. An electron micrograph of the same bouton taken from an adjacent thin section was published earlier in Zaborszky et al. (Catecholaminergic-cholinergic interaction in the basal forebrain, 1993, p. 37) with kind permission from Elsevier Science. Scale bar = 100 µm in B, 10 µm in A, C, 1 µm in D.