Nomura T, Nishikawa N, Yokota T
Department of Physiology, Medical College of Shiga, Otsu, Japan.
Brain Res. 1992 Jan 20;570(1-2):323-32. doi: 10.1016/0006-8993(92)90597-3.
Locations and morphological characteristics of nociceptive specific (NS) and wide dynamic range (WDR) neurons of the ventrobasal (VB) thalamic complex were studied using an intracellular HRP injection technique in cats anesthetized with urethane and chloralose. Both NS and WDR neurons were found within the marginal zone of the VB complex. Their somata were confined to the VB complex, but dendrites were extended into the structures of the thalamus surrounding the VB complex. NS neurons were found in the caudal part of the VB complex, whereas WDR neurons were found more rostrally. Examinations of their locations within the marginal zone of the VB complex confirmed the somatotopic organization, as found previously. We also confirmed the previous reports that there are 3 different types of low-threshold mechanoreceptive (LTM) neurons within the VB complex. They are type I, type II and type III neurons. Both NS and WDR neurons were either type I or type II neurons. Obvious morphological differences were not found between LTM neurons and two classes of nociceptive VB neurons investigated.
采用细胞内辣根过氧化物酶（HRP）注射技术，在氨基甲酸乙酯和水合氯醛麻醉的猫中，研究腹侧基底（VB）丘脑复合体中伤害性特异性（NS）神经元和广动力范围（WDR）神经元的位置及形态学特征。在VB复合体的边缘区发现了NS和WDR神经元。它们的胞体局限于VB复合体，但树突延伸至VB复合体周围的丘脑结构中。NS神经元位于VB复合体的尾部，而WDR神经元则更靠前。对它们在VB复合体边缘区内位置的检查证实了躯体定位组织，正如之前所发现的那样。我们还证实了先前的报道，即在VB复合体内存在3种不同类型的低阈值机械感受性（LTM）神经元。它们是I型、II型和III型神经元。NS和WDR神经元均为I型或II型神经元。在所研究的LTM神经元与两类伤害性VB神经元之间未发现明显的形态学差异。
