大鼠丘脑背内侧核的传入联系——WGA-HRP法研究

将WGA-HRP微电泳导入19只大鼠的丘脑背内侧核(DM)的不同部位,观察其传入投射。DM接受来自前额叶皮质、底部端脑、边缘系统、单胺类神经元、网状结构、中央灰质及上丘等广泛部位的传入,并有一定的局部定位关系。DM内侧部主要接受岛叶无颗粒皮质背部、下边缘区皮质、杏仁核簇、隔核、终纹床核以及中缝核群等的传入,可能和边缘系统功能有关。DM中间部主要接受岛叶无颗粒皮质背部及前梨状叶皮质的传入,也可能和边缘系统功能有关。DM外侧部主要接受前扣带回背侧及中央前区内侧皮质、E-W核及上丘等的传入,可能和眼球运动有关。其中,杏仁核簇、E-W核及中缝大核到DM的传入投射,文献上尚未见报道。此外,DM各部均接受来自未名质、斜角带核、外侧视前区及丘脑网状核等的传入。

AFFERENT CONNECTIONS OF THE DORSOMEDIAL NUCLEUS OF THE THALAMUS IN THE RAT WITH WGA-HRP METHOD

WGA-HRP was injected into different segment of the dorsomedial nucleus (DM) of thalamus by means of microiontophoretical delivery in 19 rats to observe the afferent projections of DM. It is found that the DM received afferent projections widely from the frontal cortex, basal telecephalon, limbic system, monoaminergic neuron, reticular formation, central gray matter and superior colliculus. Furthermore, some topographical organization has also been observed. The medial segment of DM received afferent projections mainly from dorsal agranular insular cortex, infralimbic cortex, amygdaloid complex, septum, bed nucleus of the stria terminalis and raphe nuclei, related with the function of the limbic system. The central segment of DM received afferent projections from the dorsal agranular insular cortex and the prepiriform cortex, also related with the function of the limbic system. The lateral segment of DM received afferent projections mainly from the medial precentral cortex, dorsal division of anterior cingulate cortex, E-W nucleus and superior colliculus, related with the function of eye movement. In addition, all the three segments of DM received numerous afferents from the substantia innominata, nucleus tractus diagonalis (Broca), lateral preoptic area and reticular nucleus of the thalamus.