躯体和内脏传入冲动在大鼠束旁核内的会聚

在麻痹的大鼠上,分别刺激迷走神经、内脏大神经、坐骨神经、腓肠神经、睾丸和副睾,在对侧丘脑束旁核记录到了45个细胞的单位放电。根据诱发反应的潜伏期、时程和放电频谱分布的不同,可将他们分为五种类型,并且认为这些类型和刺激引起的感觉性质有关。在观察到的45单位中,29个的反应具有痛放电的特性,而且对躯体及内脏的传入冲动呈聚合性反应。其中2个单位只对内脏传入冲动产生反应。这项研究的结果表明,束旁核不仅是接受内脏传入的丘脑结构,而且也是一个整合内脏与躯体传入信息的中枢。

CONVERGENCE OF SOMATIC AND VISCERAL AFFERENT IMPULSES IN PARAFASCICULAR NUCLEUS OF RAT

Single unit discharges of 45 neurons in the parafascicular nucleus of immobilizedrats in response to separate stimulations of N. vagus, N. splanchnus major, N. sciaticus,N. suralis, testis and epididymis were recorded and analysed. Five patterns ofthe responses could be distinguished according to response latency, discharge durationand spike density distribution, which are considered to be contingent on the sensorynature of the stimulations. Among the 45 units studied, 29 showed response patternscharacteristic of nociception and received convergence of somatic and visceral af-ferents. Two units were found to respond exclusively to visceral stimuli. Theresult is interpreted as indicating that the parafascicular nucleus is not only a thalamicstructure for reception of visceral pain but also a center for integration of visceraland somatic pain afferent impulses.