疼痛
- 英
- pain, dolor
- 同
- 痛み
- 関
- 痛覚 pain sensation
疼痛
疼痛の伝達
- Aδ線維
- C線維
疼痛の調節
- ゲートコントロール：Aδ線維とC線維による痛みはAβ線維による入力で中枢伝達細胞のレベルで抑制される。
- 下行性疼痛抑制系神経系：下行性疼痛抑制系神経系による入力で中枢伝達細胞のレベルで抑制される。
- 下行性疼痛抑制系神経系は中脳水道周辺灰白質からの脊髄への入力からなる。具体的には大縫線核(セロトニン作動性)、巨大細胞網様核・傍巨大細胞網様核(ノルアドレナリン作動性)がの2系統が起点となる。抗うつ薬はこれらの神経伝達物質の再吸収を妨げ鎮痛作用を発揮する。
痛みと異常知覚の命名法
- Adams and s Principles of Neurology, Ninth Edition Allan Ropper. table 8-2より抜粋
- dysesthesia : Any abnormal sensation described as unpleasant by the patient.
- hyperalgesia : Exaggerated pain response from a normally painful stimulus; usually includes aspects of summation with repeated stimulus of constant intensity and aftersensation.
- hyperpathia : Abnormally painful and exaggerated reaction to a painful stimulus; related to hyperalgesia.
- hyperesthesia (hypesthesia) : Exaggerated perception of touch stimulus.
- allodynia : Abnormal perception of pain from a normally nonpainful mechanical or thermal stimulus; usually has elements of delay in perception and of aftersensation.
- hypoalgesia (hypalgesia) : Decreased sensitivity and raised threshoid to painful stimuli.
- anesthesia : Reduced perception of all sensation, mainly touch.
- pallanesthesia : Loss of perception of vibration.
- analgesia : Reduced perception of pain stimulus.
- paresthesia : Mainly spontaneous abnormal sensation that is not unpleasant; usually described as "pins and needles".
- causalgia : Buming pain in the distribution of one or more peripheral nerves.