Pavlásek J, Duda P
Physiol Bohemoslov. 1975;24(3):239-47.
The relationship between the activity of the lumbar spinal interneurones and propriospinal (PS) and spino-bulbo-spinal (SBS) efferent reflex responses evoked by somatic (muscle, skin) and splanchnic nerve stimulation was studied in chloralose-anaestetized adult cats. During stimulation of one somatic nerve, the postsynaptic cord elements could be divided into three groups, according to whether their activity was was synchronous with the PS component of the efferent discharge (PS group), with the SBS component (SBS group) or with both (PS-SBS-group). Group SBS and PS-SBS interneurones were localized in the ventral quadrant of the grey matter. On stimulation of different nerves, the same interneurone could in one case respond synchronously with the PS component of the efferent discharge and in another with the SBS component. The membrane of units which did not generate propagated spike potentials during PS or SBS reflex activity was hyperpolarized in this period, or failed to display changes characteristic for postsynaptic inhibition. Convergence of somatic and visceral afferentation was observed in all three groups of postsynaptic elements. In type PS-SBS and SBS units it was massive (occurring in 85% and 100% of the cases respectively). The results confirmed the intimacy of functional contact of PS and SBS systems activated by somatic and visceral afferents.
在水合氯醛麻醉的成年猫中，研究了腰段脊髓中间神经元的活动与由躯体（肌肉、皮肤）和内脏神经刺激所诱发的脊髓固有（PS）和脊髓-延髓-脊髓（SBS）传出反射反应之间的关系。在刺激一条躯体神经时，根据突触后脊髓元件的活动是否与传出放电的PS成分（PS组）、SBS成分（SBS组）或两者（PS-SBS组）同步，可将其分为三组。SBS组和PS-SBS组中间神经元位于灰质腹侧象限。在刺激不同神经时，同一个中间神经元在一种情况下可能与传出放电的PS成分同步反应，而在另一种情况下与SBS成分同步反应。在PS或SBS反射活动期间未产生传播性动作电位的单位膜在此期间发生超极化，或未表现出突触后抑制的特征性变化。在所有三组突触后元件中均观察到躯体和内脏传入的汇聚。在PS-SBS型和SBS型单位中，这种汇聚是大量的（分别发生在85%和100%的病例中）。结果证实了由躯体和内脏传入激活的PS和SBS系统在功能上密切相关。
