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Next Article 
Journal of Neuroscience, Vol 15, 5859-5869, Copyright © 1995 by Society for Neuroscience
Distribution of pontomesencephalic cholinergic neurons projecting to substantia nigra differs significantly from those projecting to ventral tegmental area
SA Oakman, PL Faris, PE Kerr, C Cozzari and BK Hartman
Graduate Program in Neuroscience, University of Minnesota, Minneapolis 55455, USA.
Locations of pontomesencephalic cholinergic projection neurons from the
laterodorsal tegmental (LDTg) and pedunculopontine tegmental (PPTg) nuclei
to midbrain dopaminergic nuclei were mapped. Stereotaxic microinjections of
Fluoro-Gold- or rhodamine-labeled microspheres were made either to
substantia nigra (SN) or ventral tegmental area (VTA) in rat. Choline
acetyltransferase was visualized immunohistochemically. Labeled cells were
digitally mapped at multiple levels of the nuclei using an interactive
computer/microscope system. SN-projecting neurons were distributed
predominantly ipsilaterally in distinct regions of the PPTg: either at its
rostral pole or caudally in an area ventromedial to the superior cerebellar
peduncle. Few SN-projecting neurons were found in LDTg. VTA-projecting
neurons were distributed bilaterally throughout the cholinergic group,
primarily in the densest regions of the LDTg and caudal PPTg. Neurons were
not strictly segregated into these patterns. Scattered cells belonging to
either projection could be found throughout the cholinergic group on either
side. Hierarchical log- linear analysis showed these differences in
topographic distribution to be statistically significant. Subtraction of
cell density images demonstrated well delineated regions of the cholinergic
group where the projections were predominately either to SN or VTA. These
data indicate a high degree of internal organization within the
pontomesencephalic cholinergic group based on the location of efferent
projections to SN or VTA. These findings support the concept that this
cholinergic group is functionally organized in a manner which selectively
innervates motor (SN) and limbic (VTA) dopaminergic nuclei.
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