【摘要】 目的　研究斑马鱼 (Brachydaniorerio)视网膜 顶盖系统的组织结构。　方法　用组织学和数理统计对顶盖结构和视神经纤维数量及其内、外径进行定量分析。　结果　视网膜分为 10层。顶盖分为 6层 ,总厚度为2 19 73± 8 31μm。斑马鱼神经纤维总数约为 7896 0根 ,神经纤维的平均外径为 0 5 0± 0 18μm ,平均内径为 0 35±0 14 μm。视神经中未见到无髓神经纤维。 　结论　以上结果既符合脊椎动物的基本模式又反映出斑马鱼喜光、白昼活动的小型鱼个体类型的特点更多还原

【Abstract】 Objective To study the histological structures of retinotectal system in zebrafish. Methods The structures of tectum and retina were examined histologically and the total number and diameter of the optic nerve fibers were studied quantitatively. Results The retina includes 10 layers, and the tectum is differentiated into 6 layers. The mean thickness of the tectum is about 219\^7±8\^3μm. The optic nerve of zebrafish has approximately 78?960 myelinated fibers. The mean of the outer diameter (D) of the myelinated fibers was 0\^50±0\^18μm, while the mean of the inner diameter (d) is 0\^35±0\^14μm. Virtually all axons within optic nerves are myelinated.Conclusion\ The results not only accord with the typical pattern of retina and tectum in vertebrates, but also reflect the characteristic of diurnal activity and good vision in zebrafish.\;[更多还原