Abstract：
:We examined the characteristic features of galanin (GAL)-containing nerve afferents in the intermediolateral nucleus (IML) of the rat lumbosacral spinal cord (L6, S1), i.e., spinal parasympathetic nucleus, by immunocytochemistry at both light and electron microscopic levels. Firstly, the types of synapses formed by GAL-immunoreactive (IR) axon terminals and their post- or presynaptic elements were examined in random ultrathin sections. A total of 109 synapses were examined. Axodendritic (71%) and axo-somatic (20%) synapses were always of the asymmetrical type. Axo-axonic synapses (9%) were occasionally found; GAL-IR axon terminals were either postsynaptic (3%) or presynaptic (6%) to non-IR axon terminals. By confocal laser microscopy, many GAL-IR axon terminals were seen close to cell bodies and proximal dendrites of the IML neurons that were retrogradely labeled with Fluoro-Gold injected into the pelvic ganglion. Some GAL-IR axon terminals were identified to be presynaptic to them under the electron microscope, by restaining for GAL immunoreactivity with the immunoperoxidase method. These findings suggest that the GAL afferents are involved in the parasympathetic motor regulation of pelvic organs via their central synaptic influences upon preganglionic neurons. Finally, hemi-transection of the upper lumbar segments (L1-L3) or unilateral dorsal rhizotomy (L5-S2) did not significantly alter the immunoreactivity for GAL in the IML. These results suggest that GAL afferents do not originate from regions rostral to the IML nor from the dorsal root ganglion, but probably from GAL cells located at least within the lower lumbar segments and/or sacral spinal cord.
journal_name
Exp Brain Resjournal_title
Experimental brain researchauthors
Ohmachi T,Nakamura T,Zhang FZ,Tani I,Takagi Hdoi
10.1007/BF00229624subject
Has Abstractpub_date
1996-06-01 00:00:00pages
399-406issue
3eissn
0014-4819issn
1432-1106journal_volume
109pub_type
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journal_title：Experimental brain research
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更新日期：1987-01-01 00:00:00
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更新日期：2003-04-01 00:00:00
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pub_type： 杂志文章
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更新日期：1979-03-09 00:00:00
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更新日期：1989-01-01 00:00:00
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更新日期：2007-09-01 00:00:00
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pub_type： 杂志文章,评审
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更新日期：1998-07-01 00:00:00
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更新日期：1983-01-01 00:00:00
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更新日期：1997-06-01 00:00:00
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pub_type： 杂志文章
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更新日期：2010-12-01 00:00:00
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更新日期：2010-04-01 00:00:00
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更新日期：2006-10-01 00:00:00
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pub_type： 临床试验,杂志文章
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更新日期：1994-01-01 00:00:00
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pub_type： 杂志文章
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更新日期：1996-11-01 00:00:00
