Recording sites and response patterns of low thoracic (T9-T10) spinal neurons to duodenal distension (DD, 0.4 ml, 20s). A: Locations of spinal neurons responding to DD. The black circles represent neurons excited by DD. The black triangles represent neurons inhibited by DD. B: Schematic drawing of the T10 spinal segment (Molander et al. 1984). I–X indicates laminae; Liss, Liss’s tract; LSN, lateral spinal nucleus; Pyr, pyramidal tract; IL, intermediolateral nucleus. IM, intermediomedial nucleus. CC, column of Clarke. C: Short-lasting excitatory (SL-E) response to DD. D: Long-lasting excitatory (LL-E) response to DD. E: Inhibitory (I) response to DD.