大鼠三叉神经脊束核尾侧亚核胶状质突触小球的超微结构

THE ULTRASTRUCTURE OF THE SUBSTANTIA GELATINOSA GLOMERULI IN THE SPINAL TRIGEMINAL NUCLEUS OF THE RAT

用透射电镜观察了大鼠三叉神经脊束核尾侧亚核胶状质突触小球的各种突起成分及突触联系。突触小球的中央轴突终未与周围两类(一、二型)树突棘,树突干形成非对称的轴树突触。含突触小泡的二型树突棘、树突干与不含小泡的一型树突棘、树突干形成对称的树树突触,并与中央轴突终末形成树轴突触。周围轴突终末(P)与中央轴突终末形成对称的轴轴突触,并与小球内的树突形成对称的轴树突触。

The glomerular synapses of the substantia gelatinosa in the spinal trigeminal nucleus of the rat were examined by electron microscopy.The central axonal ending in the glomcruli forms asymmetrical axodendritic synapses on adjacent type 1 and type 2 dendrites.Type 2 dendritic spines or shafts(dendrites which contain synaptic vesicles)form dendrodendritic synapses on Type 1 dendritic spine or shafts(dendrites without synaptic vesicles)and also form dendroaxonic synapses on the central ending.The peripheral terminals(P)form symmetrical axoaxonic synapses on the central ending and form axodendritic synapses on the dendrites in the glomeruli.