Fig. 20.     D: Camera lucida drawing (63X) made from region shown in box in (A) depicting the distribution of PHA-L labeled fibers/terminals and ChAT labeled neurons in the medial septal nucleus-vertical limb of the diagonal band following tracer delivery to the anterior hypothalamic area (case M067). B,C: High magnification micrographs of boxed regions in (D). Arrows denote PHA-L labeled terminal varicosities in close approximation to cholinergic neuronal elements. Scale bar: 10 µm.