皮肤对从Ib传入神经到运动神经元的反射通路中传导的易化作用。
Cutaneous facilitation of transmission in reflex pathways from Ib afferents to motoneurones.
作者信息
Lundberg A, Malmgren K, Schomburg E D
出版信息
J Physiol. 1977 Mar;265(3):763-80. doi: 10.1113/jphysiol.1977.sp011742.
Abstract
- The effect of volleys in low threshold cutaneous afferents upon transmission of synaptic action from Ib afferents to motoneurones has been investigated with intracellular recording from alpha motoneurones to hind limb muscles. 2. There was facilitation from cutaneous afferents of transmission in excitatory and inhibitory reflex pathways from Ib afferents without any evidence for difference in effect on di- and trisynaptic pathways. It is postulated that volleys in cutaneous afferents evoke excitatory action in interneurones of these reflex pathways. 3. The time course of the facilitation suggest that cutaneous afferents have disynaptic excitatory connexions with the interneurones intercalated in the disynaptic Ib inhibitory pathways to motoneurones. 4. Some observations are reported suggesting that interneuronal transmission in Ib inhibitory pathways to motoneurones might be facilitated from Ia afferents. 5. The findings are discussed in relation to the presumed role of Ib reflex action in regulating muscle tension.
摘要
- 利用对后肢肌肉α运动神经元的细胞内记录，研究了低阈值皮肤传入纤维的冲动对Ib传入纤维至运动神经元的突触作用传递的影响。2. 皮肤传入纤维对Ib传入纤维在兴奋性和抑制性反射通路中的传递有易化作用，且没有证据表明对二突触和三突触通路的作用存在差异。据推测，皮肤传入纤维的冲动在这些反射通路的中间神经元中引发兴奋性作用。3. 易化作用的时间进程表明，皮肤传入纤维与插入到Ib至运动神经元的二突触抑制通路中的中间神经元有二突触兴奋性联系。4. 报告了一些观察结果，提示Ia传入纤维可能易化Ib至运动神经元抑制通路中的神经元间传递。5. 结合Ib反射作用在调节肌肉张力中假定的作用对这些发现进行了讨论。
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