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应用电镜技术，观察了大鼠中脑水管周围灰质（ＰＡＧ）腹外侧部内侧区和外侧区神经毡的超微结构。结果显示，外侧区神经毡有髓纤维多为直径大于１２μｍ的粗纤维，髓鞘厚度不等；树突直径多在１２～１５μｍ之间；突触型式以轴—树突触占优势，易见多个轴突终扣与同一树突形成突触或突触复合体，亦观察到轴—体突触、轴—轴突触和树—树突触。内侧区神经毡内有髓纤维分布稀疏，多为０６～１４μｍ的薄髓纤维；树突数量多，其直径多在１μｍ以下；突触形式有轴—树突触、轴—树突棘突触和轴—体突触。上述结果揭示了ＰＡＧ腹外侧部的内侧区和外侧区神经毡存在构筑差异。
Electron microscopy was used to observe the ultrastructure of nerve felts in the medial and lateral ventral lateral vena cava regions of the rat middle cerebral cortex (PAG). The results showed that the majority of neurofibrillary myelinated fibers in the lateral area were mostly coarse fibers with a diameter of more than 1 2μm, and the thickness of myelin sheath varied from 12 to 15μm. The synaptic type was axon-dendritic Tactile advantage, it is easy to see that multiple axonal terminal buckles with the same dendrite to form synaptic or synaptic complex, also observed axis - synaptic, axonal - axon and tree - tree synapses. Medial foramen medulla nerve fibers within the distribution of sparse, mostly 0 6 ~ 1 4μ m thin pulp fibers; the number of dendrites, the diameter of more than 1μm; synaptic forms of axonal - Spike synapse and axon-synapse. The above results revealed that there was a difference in the construction of the neurofilament between the medial area and the lateral area of the lateral part of the PAG.