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Investigations of monosynaptic connections in the central nervous system have been hindered by the lack of compatible markers that can be used at both light and electron microscopic levels. In attempts to determine synaptic contacts between fibers originating in the substantia nigra and neurons projecting to the spinal cord, we have developed a double(More)
The technique of intracellular recording and staining of the same neuron with horseradish peroxidase (HRP) was used to study the soma-dendritic and axonal morphology of nigrothalamic and nigrotectal cells in the rats. The nigrothalamic and nigrotectal cells were spread throughout the dorsoventral extent of the pars reticulata (SNR) and exhibited the same(More)
Although the rat medial agranular cortex (AGm) has been implicated in a variety of motor functions, the source of the afferents impinging upon thalamic neurons projecting to the AGm is not directly known. The main purpose of this study was to determine whether the AGm is a major recipient of the nigrothalamocortical pathway. This issue was addressed by two(More)
Very few chromogens used in immunoperoxidase reactions can be combined to simultaneously localize two neural antigens with different labels at both light (LM) and electron (EM) microscopic levels. The objective of this study was to investigate the EM properties of a novel purple chromogen introduced by LM immunostaining by Vector Laboratories under the(More)
Substantia nigra pars reticulata (SNr) neurons, antidromically activated following stimulation of the dorsal thalamus and/or superior colliculus were intracellularly stained with HRP. Light microscopic analysis revealed that the labeled SNr neurons have axon collaterals arborizing within SNr. Axon collaterals of SNr neurons partially overlapped with the(More)
Choline acetyltransferase immunhistochemistry was employed at light and electron microscopic levels in order to determine the distribution of cholinergic neurons in two subdivisions of the rat pedunculopontine tegmental nucleus that were previously defined on cytoarchitectonic grounds, and to compare the synaptic inputs to cholinergic and non-cholinergic(More)
The termination of the substantia nigra pars reticulata efferents in the nucleus tegmenti pedunculopontinus was studied in the rat by using the anterograde tracer Phaseolus vulgaris-leucoagglutinin (PHA-L). Both large and small injections of PHA-L in various portions of the substantia nigra pars reticulata labeled varicose fibers in the ipsilateral and(More)
The distribution and collateralization of ascending and descending projections from neurons in the nucleus tegmenti pedunculopontinus (PPN) were studied in the rat by using retrograde transport of HRP, HRP/WGA, and fluorescent dyes. The PPN and its two subdivisions, the subnucleus compactus (PPNc) and subnucleus dissipatus (PPNd), were delineated on(More)
The substantia nigra (SN) has long been known as an important source of afferents to the pedunculopontine tegmental nucleus (PPN). However, it has not been established which of the chemospecific cell populations receive this synaptic input. We sought to address this issue by a correlative light and electron microscopic approach that combines anterograde(More)