Studies on the retina - The structure of the retina of Alligator mississippiensis and its photomechanical changes
Studies on the retina - The structure of the retina of Alligator mississippiensis and its photomechanical changes
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DOI：
10.1002/jez.1400320204
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发表时间：
1921-02-01
影响因子：
--
通讯作者：
Detwiler, SR
中科院分区：
文献类型：
--
作者：
Laurens, H;Detwiler, SR
由于视觉细胞的种类和分布的变化，爬行动物视网膜提供了一个有趣的结构和功能研究领域，特别是关于视杆细胞和视锥细胞在昼夜条件下的可能功能（双重性理论）。Detwiler（'16）studi.艾德研究了一些海龟和蜥蜴视网膜的结构和光机械变化，并希望对我们了解爬行动物的生存条件作出另一个贡献。这项工作开始于1917年春天，但必然被放弃，直到最近才有可能恢复它。关于鳄鱼眼睛的文献很少，而且相当令人不满意。Heinemann（'77）在一项对墨西哥爬行动物眼睛的研究中，描述了Crocodilus rhombiier cuv的视觉细胞。由特征性的杆状物与相当少且较短的圆锥体交替组成。除了典型的杆状细胞外，他还发现了一种数量少得多的杆状细胞，其外部有很长的片状结构。这些锥体被描述为a。两种油滴，厚的和细的，都不含有色油滴，单独出现或一起形成双锥。有一个椭圆体与一个小的中心体在周边部分的内段，
Owing to the variat, ion in kind and distribution of the visual cells, the reptilian retina offers an interesting field of investigation in structure and function, with particular reference to the probable functions of the rods and cones under diurnal and nocturnal conditions (duplicity theory). Detwiler ('16) studi. ed the structure and photoniechanical changes in the retina of a number of turtles and of lizards, and with the idea of making another contribution to our knowledge of the conditions holding in the reptiles the present investigation was undertaken. The work was started in t, he spring of 1917, but was necessarily abandoned, and only recently has it been possible to resume it. The literature on the crocodilian eye is small and rather unsatisfactory. Heinemann ('77), in a study of the eyes of Mexican reptiles, described the visual cells of Crocodilus rhombiier cuv. as consisting of characteristic rods alternating with considerably fewer and shorter cones. In addition to the typical rods he found a much less numerous kind, with very long outer segments of platelet structure. The cones are described as being a. lso of two kinds, thick and slender, neither of which contain colored oil drops, and which occur singly and together to form double cones. There is an ellipsoid with a small central body in the peripheral portion of the inner segment of both and