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. 1984 Jun;138(Pt 4):713–732.

The substantia innominata and adjacent regions in the human brain: histochemical and biochemical observations.

R H Perry, J M Candy, E K Perry, J Thompson, A E Oakley
PMCID: PMC1164355  PMID: 6746407

Abstract

The substantia innominata was investigated in the adult human brain with particular reference to the cholinergic nature of the nucleus of Meynert. Based on histochemical observations of acetylcholinesterase activity and biochemical estimations of choline acetyltransferase the relations of the Meynert nucleus to adjacent structures in the substantia innominata region were identified precisely. A new dissection procedure is described which permits combined histochemical and histological examination of anatomically complex regions of the human brain, such as the substantia innominata, to be carried out in conjunction with accurate tissue dissection for neurochemical analysis. Using this technique, various acetylcholinesterase-positive and choline acetyltransferase-containing structures are apparent in coronal sections removed from the rostrocaudal length of the substantia innominata. These include, in addition to the prominently stained, putative cholinergic neurons, acetylcholinesterase-positive tracts which contain putative cholinergic projections to the neocortex, and 'islands' of acetylcholinesterase-positive neuropil which presumably reflect a collateral or intrinsic cholinergic innervation in the area. This anatomical complexity of cholinergic structures in the substantia innominata suggests that neurochemical analysis should be conducted on microdissected as opposed to macrodissected tissue samples. Neuropathologically, the present report provides a further basis for optimising quantification of putative cholinergic perikarya. Continued systematic analysis of the nucleus of Meynert at the morphological and biochemical level should thus establish the role of this nucleus in normal brain function and in disease.

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Selected References

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