Fig. 19.     D: Camera lucida drawing (63X) made from region shown in box in (A) illustrating the relationship of PHA-L labeled fibers/terminals and ChAT labeled neurons in the medial portion of the HDB following tracer delivery to the anterior hypothalamic area (case M067). B,C: Micrographs of neurons in boxed areas in (D) shown at higher magnification. Arrows denote PHA-L labeled terminal varicosities adjacent to cholinergic neuronal elements. Scale bar: 10 µm.