Abstract
A two color histochemical/immunohistochemical method was used to demonstrate substance P and acetylcholinesterase in sections of the human nucleus basalis of Meynert (nbM). Substance P-immunoreactive terminal-like structures were found to make contact with magnocellular, acetylcholinesterase-positive perikarya and primary dendrites throughout all subdivisions of the nbM. This apparent innervation of nbM neurons was in most cases a relatively sparse one, but asmall percentage of these neurons appeared to be recipients of a very heavy innervation which covered their perikarya and primary dendrites.
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