Table 1.

Cholinergic cell groups and their projection areas (from (M. M. Mesulam, 1996)) that are target areas for cholinergic molecular imaging. Increasing camera resolution will increasingly allow assessment of small cholinergic cell groups, such as Ch4, Ch5 and 6.

Cholinergic cell group	Major projection area
Ch1: medial septal nucleus	Hippocampus
Ch2: vertical limb nucleus of the diagonal band of Broca	Hippocampus
Ch3: horizontal limb nucleus of the diagonal band of Broca	Olfactory bulb
Ch4: nucleus basalis of Meynert	Amygdala & neocortex
Ch5: pedunculopontine nucleus	Thalamus
Ch6: laterodorsal tegmental complex	Thalamus