Second pain

Japanese: second pain(英語表記)secondpain
Second pain

…The peripheral nerve fibers that transmit stabbing pain are thin, myelinated fibers with a diameter of 2-5 μm and a conduction speed of 12-30 m/s, called Aδ fibers, while the fibers that transmit burning pain are even thinner, unmyelinated C fibers with a diameter of about 1 μm and a conduction speed of 0.5-2.0 m/s. Therefore, the pain felt first is called first pain, and the pain felt later is called second pain. Deep pain and visceral pain are also transmitted by Aδ and C fibers, but both of these are aching pains. …

*Some of the terminology that mentions "second pain" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…刺す痛みを伝える末梢神経繊維は,直径が2~5μmで,12~30m/sの伝導速度をもつ細い有髄の繊維でAδ繊維とよばれるが,やけつく痛みを伝えるのは,直径約1μmで0.5~2.0m/sの伝導速度をもつさらに細い無髄の神経繊維のC繊維である。そこで,初めに感ずる痛みを第1痛first pain,次いで遅れて感ずる痛みを第2痛second painともいう。深部痛と内臓痛もAδ繊維とC繊維によって伝えられるが,これらはいずれもうずく痛みである。…

※「second pain」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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