Motorina M V
Arkh Anat Gistol Embriol. 1986 Jul;91(7):13-20.
By means of light and electron microscopy methods structural peculiarities of motor nuclei have been studied in the rat spinal cord (17 animals) on the 1st-3d and on the 10th-18th days of postnatal ontogenesis. Synaptic junctions of the gap type are revealed; they are considered as electrotonic synapses. Dendro-somatic and dendrodendritic synaptic junctions of the gap type are found. Together with the electrotonic synapses, morphologically mixed synapses of axo-somatic and axo-axonal types are disclosed; they contain, besides organells, specific for chemical synapses, close opposition areas of pre- and postsynaptic membranes of the gap junction type. Morphologically mixed synapses occur in neuropil of the motor nuclei of the spinal cord in young rats of all age groups studied. Homologous synapses are detected in the motor nuclei of the white mouse spinal cord. Synaptic junctions of the gap type in the mammalian spinal cord could be a substrate of electrical interaction between its motor neurons.
借助光学和电子显微镜方法，在出生后个体发育的第1至3天以及第10至18天，对17只大鼠脊髓运动核的结构特征进行了研究。发现了缝隙型突触连接；它们被认为是电突触。发现了树突-胞体和树突-树突缝隙型突触连接。除了电突触外，还发现了轴突-胞体和轴突-轴突类型的形态学混合突触；除了化学突触特有的细胞器外，它们还包含缝隙连接型突触前膜和突触后膜的紧密相对区域。在所研究的所有年龄组的幼鼠脊髓运动核神经毡中均出现形态学混合突触。在小白鼠脊髓运动核中检测到同源突触。哺乳动物脊髓中的缝隙型突触连接可能是其运动神经元之间电相互作用的基础。
