Which neurotransmitter is synthesized in the nucleus basalis of Meynert and basal forebrain, with projections to the hippocampus, amygdala, and cortical association areas, and acts at nicotinic and muscarinic receptors?

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The central idea here is the basal forebrain cholinergic system and its widespread cortical and limbic projections. The nucleus basalis of Meynert is a primary source of acetylcholine for the cortex, hippocampus, and amygdala. Acetylcholine is synthesized by the enzyme choline acetyltransferase in these cholinergic neurons and acts on two receptor families: nicotinic receptors (ionotropic) and muscarinic receptors (metabotropic). This cholinergic signaling helps regulate attention, learning, and memory by modulating cortical plasticity and arousal as signals reach the hippocampus and cortical association areas.

The described pattern does not fit the other neurotransmitters. GABA is the main inhibitory transmitter produced in many interneurons, not the principal basal forebrain source discussed here. Glutamate is the brain’s main excitatory transmitter, likewise not specific to this basal forebrain nucleus and projection pattern. Norepinephrine comes from the locus coeruleus and has a different widespread modulatory system, not the nucleus basalis projections to hippocampus and cortex.