Abstract

The monoamine levels in the locus coeruleus (LC) were determined by HPLC following specific lesions of the ventral mesencephalic tegmental-A-10 regions (VMT-A10) and raphe´dorsalis (RD). Only lesions in the VMT-A10 area decreased the dopamine (DA) content, which strongly suggests that the projection from this region to the LC is of dopaminergic nature. Lesions of the RD increased DA metabolism in the LC and provoked significant decreases in the serotonin (5-HT) levels.

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