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本文运用液氮冷冻断裂及扫描电镜研究狗小脑皮质神经元的构筑及其突触联系。在颗粒层中,卵圆形和圆形的颗粒细胞多聚集成簇,细胞表面粗糙不平并有无分支的线状轴突和具有爪状末梢的锥形树突。Golgi细胞位于颗粒细胞之间,它们形体较大,具有水平和上升的树突。苔藓纤维、颗粒细胞树突及Golgi细胞轴突之间形成突触联系,而且苔藓纤维与颗粒细胞树突之间有直接联系。在Purkinje层中清楚地显示出Purkinje细胞的三维构型。细胞体呈三角形或圆形,表面粗糙,细胞树突延伸至分子层。分子层中可见Purkinje细胞的二级和三级树突分支,平行纤维与Purkinje细胞棘形成突触。本文尚讨论了小脑皮质神经元构筑及其突触联系的机能意义。
In this paper, cryogenic fracture and scanning electron microscopy were used to study the construction of the cerebellar cortical neurons and their synaptic connections. In the granular layer, ovoid and round granular cells clustered into clusters, the cell surface was rough and with or without branched linear axons and conical dendrites with clawlike terminals. Golgi cells are located between granulosa cells, which are larger in size and have raised and dendrites levels. Mossy fibers, granulosa cell dendrites and Golgi axons form synaptic connections, and there is a direct relationship between mossy fibers and granulosa cell dendrites. The three-dimensional configuration of Purkinje cells is clearly shown in the Purkinje layer. Cell body was triangular or round, rough surface, cell dendrites extend to the molecular level. In the molecular layer, secondary and tertiary dendritic branches of Purkinje cells are visible and parallel fibers form synapses with Purkinje cells. This article also discusses the functional significance of cerebellar cortical neurons construction and synaptic connections.