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Noradrenergic axon terminals in the substantia gelatinosa of the rat spinal cord

An electron-microscopic study using glyoxylic acid-potassium permanganate fixation

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Summary

The noradrenergic terminals in the substantia gelatinosa of the dorsal horn of the cervical spinal cord of the rat were investigated by means of the histofluorescence technique and electron-microscopic cytochemistry using the glyoxylic acid-KMnO4 fixation technique. In accordance with the topographical distribution of fluorescent catecholaminergic fibers, noradrenergic terminals containing small granular vesicles were frequently observed electron microscopically in the outer layer of the substantia gelatinosa. These terminals were most frequently found to appose without showing typical synaptic features, small-caliber dendrites, spine apparatus, and rarely, large caliber dendrites. Only in a few cases, the noradrenergic terminals exhibited typical synaptic contacts with dendritic elements of small size. In addition, noradrenergic terminals apposed non-noradrenergic terminals containing small agranular vesicles. In rats bearing surgical lesions of the dorsal roots, no noradrenergic terminal were found in contact with the degenerated axon terminals in the substantia gelatinosa. These findings suggest that the noradrenergic afferents to the substantia gelatinosa may exert their influence on sensory transmission via dorsal horn cells.

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Authors and Affiliations

  1. Department of Anatomy and Psychiatry, Shiga University of Medial Science, Tsukinowa-cho, Otsu, Japan

    K. Satoh, H. Kimura &  T. Maeda

  2. Nakamiya Mental Hospital, Hirakata, Osaka, Japan

    A. Kashiba

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  1. K. Satoh
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  2. A. Kashiba
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  3. H. Kimura
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  4. T. Maeda
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Satoh, K., Kashiba, A., Kimura, H. et al. Noradrenergic axon terminals in the substantia gelatinosa of the rat spinal cord. Cell Tissue Res. 222, 359–378 (1982). https://doi.org/10.1007/BF00213218

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