The Ontogeny of Acetylcholinesterase Activities in Rat Brain Regions and the Effect of Chronic Treatment with Manganese Chloride

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Abstract
Acetylcholinesterase activities were determined in the rat cerebral cortex, striatum, midbrain, pons and medulla, hypothalamus, and cerebellum at 5, 12, 20, 30, and 60 days after birth. The ontogeny of the enzyme differed in the various regions, occurring earlier in the more caudal regions, except in the cerebellum where there was no increase. Chronic manganese treatment from conception did not influence the developmental profile of this cholinergic marker.