1.13. Non-cholinergic Neurons in the Basal Forebrain
Recently, several different non-cholinergic cell types were characterized within the basal forebrain on the basis of morphology and neurochemical features. For example, a sizable proportion of neurons innervating allocortical areas are non-cholinergic, using either GABA and/or possibly peptides as transmitters (Carlsen et al., 1985; Fischer et al., 1988; Geula and Mesulam, 1994; Wainer et al., 1993; Semba and Fibiger, 1989; Walker et al., 1989; Woolf, 1991; Zaborszky et al., 1986). In additions, many of the GABAergic neurons in the basal forebrain project to the reticular thalamic nucleus (Asanuma and Porter, 1990; Bickford et al., 1994) and give rise to a significant descending projections into the caudal diencephalon and/or brainstem (Gritti et al., 1994). Another GABAergic cell population may serve as interneurons and as a potential source of GABAergic innervation to the nearby cortically projecting cholinergic neurons (Gritti et al., 1993; Ingham et al., 1988; Zaborszky et al., 1986b).
1.13.1. Peptidergic Neurons. Somatostatin.
1.13.2. Calcium Binding Protein Containing Neurons.