| Project/Area Number |
11670605
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Neurology
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| Research Institution | Hirosaki University |
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Principal Investigator |
BABA Masayuki Hirosaki University School of Medicine Assistant Professor, 医学部, 助教授 (90106849)
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| Co-Investigator(Kenkyū-buntansha) |
OZAKI Isamu Aomori University of Health Science Assistant Professor, 健康科学部, 助教授 (90241463)
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| Project Period (FY) |
1999 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 2000: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1999: ¥2,400,000 (Direct Cost: ¥2,400,000)
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| Keywords | sensory nerve / tactile stimulation / Paccini corpusle / Meisser corpsule / nerve conduction / neurophysiology / compound potential / 感覚神経電位 / 触覚電位 / 機械受容器 / Pacini小体 |
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| Research Abstract |
Various mechanoreceptors may respond to tactile stimulli to the human skin. We investigated sensory potentials from the skin evoked by tactile stimuli with indentations of 300 μm at velocities of 100 (T100) and 400 μm/ms (T400) applied to the tip (FT) and the proximal phalanx of digit III (PP) and the thenar eminence (Pm) of 10 healthy volunteers. We compared with responses after electrical stimulation at FT.Compound sensory action potentials (CSAPs) were recorded from the median nerve through needle electrodes at wrist and elbow. The maximal sensory conduction velocities (SNCVs) between wrist and elbow were similar with electrical and T400 stimulation, but on average were 15% lower with T100 stimulation (P<0.001). With both indentation velocities, SNCVs were similar regardless of stimulation sites. Amplitudes of tactile CSAPs with FT stimulation were 1-2 μV at T400 and 0.3-0.4μV at T100. The CSAP areas evoked by T100 stimulation showed a reduction from fingertip to proximal finger to palm (P<0.05-0.005) whereas those obtained with T400 stimulation showed a reduction only at palm (P<0.05). The results support that fast indentation at 400 μm/ms activated deeply placed Pacinian corpuscles as well as superficially situated Meissner corpuscles, whereas the slower indentation at 100 μm/ms activated primarily Meissner corpuscles.
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