大鼠三叉神经脊束核尾侧亚核胶状质非小球突触成分

NONGLOMERULAR SYNApSES IN THE SUBSTANTIA GELATINOSA OF THE RAT SPINAL TRIGEMINAL NUCLEUS

用透射电镜观察了大鼠三叉神经脊束核尾侧亚核胶状质神经毡非小球的突触成分。非小球的突触大部分为轴树突触,此外还见到轴轴、树树及树轴突触。它们的轴突终末成分,按所含小泡的形状,区分为圆形小泡终末、扁平小泡终末、多形小泡终末及大颗粒小泡终末。圆形小泡终末根据小泡的大小又有大圆形小泡终末及小圆形小泡终末。本文还讨论了突触分类及各种轴突终末的机能意义。

Nonglomerular synapses in the neuropil of the substantia gelatinosa of adult ratspinal trigeminal nucleus were subjected to electron microscopic examination.Nonglomerular synapses in the substantia gelatinosa were associated with four main types of axonal terminals.On the basis of vesicle shapes,these were classified as round vesicle,elongate vesicle,pleomorphie vesicle,and dense cored vesicle terminals.The category of round vesicle terminals could be subdivided into large round vesicle terminals and small round vesicle terminals according to their different size of synaptic vesicles.Nonglomerular synapses included four types,i.e.axodendritic,axo-axonic,dendro-dendritic and dendro-axonic synapses.Of these,the majority of synapses were axodendritie.The functional significance of the classification of these synapses and their axonal terminals had been discussed.