大脑皮质棘器的超微结构

本文用电镜观察了猫和大白鼠大脑皮质中的突触2031个,其中在突触后成分或其他结构中具有棘器结构的有285个,对显示较为清楚的237个棘器,做了如下的观察和统计分析:1.组成棘器囊泡的类型有五种,其中以扁平囊型最多(74.26%)。组成棘器囊泡的排列样式不一,多数呈平行排列(83.97%);但也有呈蹄铁形、编带形或分散排列。2.组成棘器的囊泡数目变化较大,多数在3～6个之间,个别例可达10个以上。本文还观察到在一个侧棘中有时可出现2～3个(18例)棘器。3.棘器多位于轴棘突触的后成分中,但有的含有棘器的侧棘,在切片上不形成突触。在侧棘中的棘器,多数位于侧棘小头内;也有的位于侧棘小柄中;少数位于树突干或树突与侧棘的移行部。4.致密带的形态较为复杂,多数呈细条状;有的呈宽带状、斑点状、小颗粒状或云雾状。致密带多位于相邻两个囊泡之间;有少数例位于棘器的一侧;有的致密带的一端或其分支与囊泡愈合。

ULTRASTRUCTURE OF THE SPINE APPARATUS IN CEREBRAL CORTEX

273 spine apparatus were observed under electron microscope. The results were as follows: 1.The flat-type sac of 5 types of the sac which constituted the spine apparatus covered the majority. Most of them were arranged parallelly and a few dispersively. The horseshoe or braid shaped arrangement was also seen in some cases. 2.The number of the sac varied from 3 to 6 in most of the cases, and a few over 10. Sometimes 2 or 3 spine apparatus can be seen within a single dendritic spine. 3.The spine apparatus often locates in the dendritic spine. In some cases the spine apparatus can be seen within the dendrites or in the juncture of dendritic trunk and dendritic spine 4.The morphological structure of the dense bands is comparatively complex. Most of the bends are narrow, some are broad, fine granular or mist-like in shape. The dense bends are located in between the adjacent sacs mostly and in few cases on one side of the spine apparatus. In some cases, one end of the dense band is fused with the sac.