Motorina M V
Arkh Anat Gistol Embriol. 1980 Mar;78(3):33-42.
Ultrastructural peculiarities of motoneurons and synapses in the area of the motor nuclei in the spinal cord of 10--18-day-old rats were revealed electron microscopically. It was stated that by the 14th day of age motoneurons acquire features of mature neurons. Several types of synapses were found: axo-dendritic, axo-somatic, axo-axonal. Axo-dentritic synapses prevail in neuropil of the spinal cord motor nuclei at the age studied. Synapses in 10--13-day-old rats sometimes demonstrate an immature ultrastructure. A peculiar feature of the neuropil is the presence of dendritic bundles consisting of dendrites various in their calibers or of dendrites and preterminal parts of axons. The data obtained from the spinal cord of rats at the age up to 1 month neurohistologically treated add something new to our knowledge on structure of motor nuclei of the rat spinal cord in postnatal ontogenesis.
通过电子显微镜观察，揭示了10至18日龄大鼠脊髓运动核区域运动神经元和突触的超微结构特征。结果表明，到14日龄时，运动神经元具备了成熟神经元的特征。发现了几种类型的突触：轴突-树突型、轴突-胞体型、轴突-轴突型。在所研究的年龄阶段，轴突-树突型突触在脊髓运动核的神经毡中占主导地位。10至13日龄大鼠的突触有时表现出不成熟的超微结构。神经毡的一个特殊特征是存在由不同管径的树突或由树突和轴突终末前部分组成的树突束。对1月龄以下大鼠脊髓进行神经组织学处理所获得的数据，为我们关于大鼠脊髓运动核在出生后个体发育中的结构知识增添了新内容。
