Foveal shape, ultrastructure and photoreceptor composition in yellow-legged gull, Larus michahellis (Naumann, 1840)
Foveal shape, ultrastructure and photoreceptor composition in yellow-legged gull, Larus michahellis (Naumann, 1840)
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黄腿鸥 Larus michahellis 的中心凹形状、超微结构和光感受器组成（Naumann，1840）
DOI：
10.1007/s00435-020-00512-2
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发表时间：
2021
期刊：
影响因子：
1
通讯作者：
M. García
中科院分区：
文献类型：
--
作者：
N. Victory;Y. Segovia;M. García
采用免疫荧光和透射电子显微镜相结合的方法，对黑嘴鸥(Larus Michahellis)中心凹的解剖和组织学特征进行了研究。在视力较高的区域，在整个视野中呈带状延伸，在果胶眼球附近可观察到中央回旋状深凹。此外，在背鼻区还存在一个浅凹。中央深中心凹的特征是一个明显且挖得很好的凹陷，内含极薄的视锥细胞，视锥细胞轴突和视网膜内层发生径向移位。免疫荧光显示无视杆细胞，存在紫色和绿色/红色敏感的锥体视蛋白。超微结构分析证实，没有双锥细胞，特化的米勒细胞突起形成了稳定中心凹结构的网络结构。这种深中央凹提供了最高分辨率和颜色辨别能力，可用于单眼侧视远处物体和双眼注视。鼻背中心凹较浅，所有视网膜层均位于眼窝内。该中心凹显示了与中央中心凹相同的光感受器成分，并可用于放大视网膜图像的一个宽广的单眼部分。黄腿海鸥视网膜的双凹状态允许形成三个独立而不同的视野：由背侧和中央凹调节的两个宽的外侧单眼视野，以及由中央深凹调节的小的双眼视野，这取决于眼睛的运动。
The anatomical and histological features of the foveae in a gull, Larus michahellis , were investigated combining immunofluorescence and transmission electron microscopy. In an area of higher acuity, which extends in a band across the field of view, a central convexiclivate deep fovea was observed near of the pecten oculi . Moreover, a shallow fovea was present in the dorsonasal region. The central deep fovea was characterized by a remarkably and well-excavated pit containing extremely thin cones and a radial displacement of the cone axons and inner retinal layers. Immunofluorescence demonstrated the absence of rods and the presence of violet and green/red sensitive cone opsins. Ultrastructural analyses confirmed the lack of double cones, and specialized Müller cell processes forming a network that stabilizes the foveal structure. This deep central fovea, which provides the highest resolution and colour discrimination, may be used for monocular sideways vision of distant objects and a binocular fixation. The dorsonasal fovea was shallower and all retinal layers were present at the pit. This fovea showed the same composition of photoreceptors than central fovea and could be implied in magnification of a wide monocular part of the retinal image. The bifoveate condition of yellow-legged gull retina would allow the formation of three separate and distinct visual fields: two wide lateral monocular fields mediated by the dorsonasal and the central foveae, and a small binocular field mediated by the central deep fovea depending on ocular movements.
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影响因子：
3.7
作者：
Niessner C;Denzau S;Gross JC;Peichl L;Bischof HJ;Fleissner G;Wiltschko W;Wiltschko R
通讯作者：
Wiltschko R
影响因子：
3.4
作者：
Agte, Silke;Junek, Stephan;Reichenbach, Andreas
通讯作者：
Reichenbach, Andreas
影响因子：
4.4
作者：
Ruggeri, Marco;Major, James C., Jr.;Jiao, Shuliang
通讯作者：
Jiao, Shuliang
影响因子：
3.4
作者：
LEWIS, GP;KASKA, DD;FISHER, SK
通讯作者：
FISHER, SK
鸟类中央凹中的穆勒细胞排列：在视觉中的可能作用。
DOI：
10.1166/jnsne.2014.1104
发表时间：
2014
期刊：
Journal of neuroscience and neuroengineering
影响因子：
--
作者：
Zueva,Lidia;Makarov,Vladimir;Zayas-Santiago,Astrid;Golubeva,Tatiana;Korneeva,Elena;Savvinov,Alexey;Eaton,Misty;Skatchkov,Serguei;Inyushin,Mikhail
通讯作者：
Inyushin,Mikhail