本文采用顺行溃变法对猫丘脑腹后内侧核内发自三叉神经尾侧脊束核的三叉丘系纤维终末的超微结构及其突触联系进行了研究。在电灼损毁三叉神经尾侧脊束核四天后 ,在电镜下发现丘脑腹后内侧核内的三叉丘系终末存在三种溃变形式 ,即 :电子致密型溃变 ,电子透明型溃变及神经微丝型溃变 ,以电子致密型溃变终末最为常见。溃变的三叉丘系终末常较大 ,含有大量密集的圆形无颗粒小泡 ,在丘脑腹后内侧核内主要形成不对称型轴—树突触 ,多数溃变轴终末还参与形成以树突为中心的汇聚型突触复合体 In this paper, we studied the ultrastructural and synaptic connections of trigeminothalamic terminals derived from the tail nucleus of the trigeminal nerve in the ventral medial nucleus of the thalamic thalamus of the cats by means of an anterior degeneration method. Four days after cauterization of the caudal spinal caudate nucleus of the trigeminal nerve by electrocautery, there were three types of ulceration at the terminal of the trigeminotracheal system in the medial ventromedial nucleus of thalamic nucleus under electron microscopy: electron densification and electron degeneration And neurofilament-type ulceration, electron-dense ulceration terminal is the most common. The ulcerated trigeminal system often has a large terminal end, contains a large number of round, particle-free vesicles, and forms asymmetric axonal-dendritic synapses in the medial ventricle of the thalamus. Most of the terminal end of the degenerated shaft also participates in the formation A dendritic convergent synaptic complex