Brain, Vol 121, Issue 12 2249-2257, Copyright © 1998 by Oxford University Press
NR Selden, DR Gitelman, N Salamon-Murayama, TB Parrish and MM Mesulam
All sectors of the human cerebral cortex receive dense cholinergic input.
The origin of this projection is located in the Ch4 cell group of the
nucleus basalis of Meynert. However, very little is known about the
location of the pathways which link the cholinergic neurons of the nucleus
basalis to the human cerebral cortex. This question was addressed in
whole-hemisphere sections processed for the visualization of multiple
cholinergic markers. Two highly organized and discrete bundles of
cholinergic fibres extended from the nucleus basalis to the cerebral cortex
and amygdala and were designated as the medial and lateral cholinergic
pathways. These bundles contained acetylcholinesterase, choline
acetyltransferase and nerve growth factor receptors, confirming their
cholinergic nature and origin within the basal forebrain. The medial
pathway joined the white matter of the gyrus rectus, curved around the
rostrum of the corpus callosum to enter the cingulum and merged with fibres
of the lateral pathway within the occipital lobe. It supplied the
parolfactory, cingulate, pericingulate and retrosplenial cortices. The
lateral pathway was subdivided into a capsular division travelling in the
white matter of the external capsule and uncinate fasciculus and a
perisylvian division travelling within the claustrum. Branches of the
perisylvian division supplied the frontoparietal operculum, insula and
superior temporal gyrus. Branches of the capsular division innervated the
remaining parts of the frontal, parietal and temporal neocortex.
Representation of these cholinergic pathways within a 3D MRI volume helped
to identify white matter lesion sites that could interfere with the
corticopetal flow of cholinergic pathways.
ARTICLES
Trajectories of cholinergic pathways within the cerebral hemispheres of the human brain
Cognitive Neurology and Alzheimer Disease Center, Northwestern University Medical School, Chicago, Illinois 60611, USA.
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