Summary
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1.
The reflex discharge evoked by somatic afferent nerve stimulation in 76 spontaneously active preganglionic sympathetic fibres from lumbar white rami (WR) were studied with single-unit recording techniques in chloralose anaesthetized cats.
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2.
The reflex discharges of these units were analyzed as to the presences of the 4 different somato-sympathetic reflex pathway components which are known from previous mass recording of these reflexes, namely: a) the early, or spinal, b) the late, or medullary and c) the very late, or suprapontine reflex discharge components evoked by group (Gr.) II+III somatic afferent stimulation, and d) the reflex discharge component evoked by stimulation of Gr. IV somatic afferents.
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3.
Individual units could be excited through all 16 combinations of these 4 different reflex pathways.
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4.
In total, 53% of the units displayed the early reflex discharge component, 67% the late, 37% the very late, and 47% the Gr. IV afferent-reflex.
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This work was supported by Deutsche Forschungsgemeinschaft.
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Sato, A. The relative involvement of different reflex pathways in somato-sympathetic reflexes, analyzed in spontaneously active single preganglionic sympathetic units. Pflugers Arch. 333, 70–81 (1972). https://doi.org/10.1007/BF00586043
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DOI: https://doi.org/10.1007/BF00586043