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首页> 外文期刊>Avian Biology Research >The structure of the retina of the Eurasian Eagle-owl and its relation to lifestyle
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The structure of the retina of the Eurasian Eagle-owl and its relation to lifestyle

机译：欧亚鹰猫头鹰视网膜的结构及其与生活方式的关系

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摘要

The retinal layers of birds are the same as those of other vertebrates; however, some variations exist in morphology, areas of visual acuity, and retinal vascularisation. Moreover, as a result of the relationship between environment, visual perception and behaviour, some variations are observed between diurnal and nocturnal birds. In this study, we have investigated the retina of the Eurasian Eagle-owl (Bubo bubo hispanicus) by optical microscopy. The results indicate that the retina has features of both nocturnal and diurnal birds. The pigment epithelium cells have long prolongations filled with melanin granules. The rod is the dominant photoreceptor, but simple cones are abundant. Yellow and colourless oil droplets and paraboloid are present in the inner segment of cones. In the inner nuclear layer, the cell bodies of horizontal cells can easily be recognised by a large and pale cytoplasm. Bipolar cell perikarya are identified by their dark nuclei and the round and narrow cytoplasm. Amacrine cells, located in the inner border of the inner nuclear layer, have a round perikarya and lightly stained nuclei. Muller cells bodies, also located in this region, have an irregular shape. Finally, ganglion cells which are characterised by the prominent nuclei and nucleoli vary in size and abundance depending on different regions in the retina. The morphological characteristics of this retina indicate that B. b. hispanicus have a high light sensitivity, the capacity to discriminate colour, a complex visual processing in the inner retina in order to mediate contrast and motion and, possibly, an elevated acuity in areas of high photoreceptor and ganglion cell density.
机译：视网膜层与其他脊椎动物的视网膜层相同;然而，某些变化存在于视力和视网膜血管的形态学中存在。此外，由于环境之间的关系，视觉感知和行为之间的关系，在昼夜和夜间鸟类之间观察到一些变化。在这项研究中，我们通过光学显微镜调查了欧亚鹰眼（Bubo Bubo Hispanicus）的视网膜。结果表明，视网膜具有夜间和昼夜鸟类的特征。颜料上皮细胞长期延长，含有黑色素颗粒。棒是主导的感光体，但简单的锥体很丰富。黄色和无色油滴和抛物面存在于锥体的内部段中。在内核层中，水平细胞的细胞体可以容易地通过大且浅浅细胞质识别。双极细胞perikarya由它们的黑核和圆形和窄细胞质鉴定。位于内核层内边界的胺碱细胞具有圆形的脑神和轻微染色的核。在该区域中也具有不规则形状的Muller细胞体。最后，特征在于突出的细胞核和核仁的神经节细胞根据视网膜中的不同区域而变化而变化。该视网膜的形态学特征表明B. b。 Hispanicus具有高光灵敏度，辨别颜色的能力，内视网膜中的复杂视觉处理，以便在高感光体和神经节细胞密度的区域中介导对比和运动，并且可能是升高的敏锐度。

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