Zhang A L, Cheng Z F
Department of Physiology, Xi'an Medical University.
Sheng Li Xue Bao. 1990 Jun;42(3):203-9.
When periaqueductal gray (PAG) was stimulated with concentric electrodes, a steady negative potential called PAG-DRP was recorded from L5 dorsal root. PAG-DRP with properties of spatial and temporal summation propagates decrementally along the dorsal root and is inhibited by picrotoxin. Lesions of NRM had no effect on the PAG-DRP evoked by stimulation of dorsal PAG, but showed obvious reduction up to about 40% on the PAG-DRP evoked by stimulation of ventral PAG. It is suggested that the descending inhibition of PAG includes some presynaptic inhibition and that the ventral PAG-DRP is relayed partly via NRM while the dorsal PAG-DRP is not associated with NRM.
当用同心电极刺激导水管周围灰质（PAG）时，从腰5背根记录到一种稳定的负电位，称为PAG - DRP。具有空间和时间总和特性的PAG - DRP沿背根递减性传播，并被印防己毒素抑制。中缝大核（NRM）损毁对刺激背侧PAG诱发的PAG - DRP没有影响，但对刺激腹侧PAG诱发的PAG - DRP有明显降低，可达约40%。提示PAG的下行抑制包括一些突触前抑制，腹侧PAG - DRP部分经NRM中继，而背侧PAG - DRP与NRM无关。
