家兔脊髓腰骶部中间外侧核区的超微结构——神经纤维网和突触

本实验用家兔7只,取腰髓2～4和骶髓2～4节中间外侧核区,做超薄切片,电镜观察。此区的神经纤维网内含树突、轴突、轴突终末、终端树突、突触和突触球。胶质细胞的突起穿行其间。树突散在,形态和大小多变。轴突则常成束分布。突触连接以轴树和轴体突轴为多见,偶见轴轴突触。多数突触单独存在,部分形成以树突或轴突为中心的突触球。突触内的突触小泡有清亮的圆形、椭圆形、扁平形和不规则形,还有相当多见的大致密核心小泡和少数有衣小泡。依终末囊内突触小泡的形态和突触前后膜的对称与不对称,所见突触可分为三类:1.圆形小泡不对称型;2.扁平小泡对称型;3.其它中间类型。

ULTRASTRUCTURE OF THE INTERMEDIOLATERAL NUCLEUS OF THE LUMBAR AND SACRAL SPINAL CORD OF THE RABBI: TNEUROPIL AND SYNAPSES

The neuropil in the area of the nucleus intermediolateralis is compossed of dendrites, axons, axonal terminals, synapses and processes of the neuroglia passed through them. The dendrites are scattered and variant in size and shape. Small axons, on the other hand, usually have regular contours and tend to travel in bundles. Three types of synaptic connections were found, the axo-dendritic, axo-sometic and axo-axonic synapses. Some of the synapses form glomerulus in which the dendrite or the axon may be the center. The presynaptic terminals contain numerous synaptic vesicles of various patterns. The pre-and postsynaptic membranes may be asymetrical or symetrical. According to the shape of the synaptic vesicles and the relative thickness of the pre-and postsynaptic membrane the synapses may be classified into three types: 1, spheric vesicle asymetrical type, 2, flattened vesicle symetrical type, and 3, intermediate type.