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• W2003017861 endingPage "312" @default.
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• W2003017861 abstract "We have used a monoclonal antibody against choline acetyltransferase (ChAT) to aid in the identification of sympathetic preganglionic neurons (SPNs) and to examine their ultrastructure in rat thoracic spinal cord. The clusters of ChAT-immunoreactive (ChAT-IR) preganglionic cell bodies and their distinctive bundles of dendrites give rise to a ladder-like appearance in horizontal light microscopic sections. This organization also produced a characteristic appearance of preganglionic neuropil when viewed electron microscopically. The intermediolateral (IML) nucleus contained numerous rostrocaudally oriented ChAT-IR dendrites. In addition, mediolaterally oriented ChAT-IR dendrites extended between the IML and the central autonomic region. Both the ChAT-IR dendrites and somata of preganglionic neurons were intimately associated with astroglial processes. The cell bodies were typically covered over a large proportion of their surface by a thin astrocytic sheath, and this was associated with a paucity of axon terminals forming axosomatic synapses. Instead, the vast majority of synapses upon SPNs were of the axodendritic type. The most frequently observed type of axon terminal contained numerous round, clear vesicles along with several dense-core vesicles (DCVs). In addition, some boutons contained a predominance of DCVs. Serial section analysis revealed that these apparently diverse morphological classes of synaptic boutons may simply represent variability of structure throughout a single terminal, with a greater proportion of DCVs being located distal to the synaptic specialization and a greater number of round, clear vesicles being present adjacent to the synapse. Analysis of the dendritic bundles revealed that individual dendrites, like the cell bodies, were often isolated from each other and the surrounding neuropil by astrocytic processes. This arrangement usually was interrupted only at regions of synaptic contact where astrocytic processes surrounded the synaptic complex as a whole. Thus, astroglial ensheathment of SPNs seems designed to minimize cross-talk between the bundled dendrites, as well as to isolate or segregate the diverse afferent inputs known to impinge on these cells." @default.
• W2003017861 created "2016-06-24" @default.
• W2003017861 creator A5082123109 @default.
• W2003017861 creator A5085380299 @default.
• W2003017861 date "1990-01-01" @default.
• W2003017861 modified "2023-09-23" @default.
• W2003017861 title "Ultrastructural analysis of choline acetyltransferase-immunoreactive sympathetic preganglionic neurons and their dendritic bundles in rat thoracic spinal cord" @default.
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• W2003017861 doi "https://doi.org/10.1002/syn.890050407" @default.
• W2003017861 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/2360197" @default.
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