Skeletal elements within teleost eyes and a discussion of their homology
Skeletal elements within teleost eyes and a discussion of their homology
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DOI：
10.1002/jmor.10479
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发表时间：
2006-11-01
影响因子：
1.5
通讯作者：
Hall, Brian K.
中科院分区：
文献类型：
--
作者：
Franz-Odendaal, Tamara A.;Hall, Brian K.
巩膜小骨和巩膜软骨构成了许多脊椎动物颅面骨骼的一部分。一些脊椎动物，包括所有鸟类和大多数爬行动物，但不包括大多数哺乳动物，有巩膜软骨和巩膜小骨来支撑它们的眼睛。与这些元素相当的硬骨鱼在文献中很少受到关注。通过对376种硬骨鱼400多个个体的x线摄影和全片分析，我们得出结论，硬骨鱼的巩膜骨骼元素（小骨和软骨）与爬行动物（包括鸟类）有很大不同。与爬行动物相比，硬鱼的巩膜小骨具有不同的发育起源、在眼球内的不同位置以及与巩膜软骨元件的不同关系。通过对四种硬骨鱼（Danio rerio, Salmo salar， Esox lucius和Alosa pseudoharengus）生长系列的全片染色，我们解释了这些元素的发展，并表明它们起源于发育早期在眼睛周围形成的阿利新蓝染色软骨环。我们提出了这些巩膜骨骼元素从一个共同的颌口龙祖先进化而来的可能情景，并认为硬骨鱼巩膜骨骼元素可能与爬行动物的巩膜骨骼元素不同源。我们的研究表明，不能假设这些元素同源性，尽管它们有相同的名字，巩膜小骨。
Scleral ossicles and scleral cartilages form part of the craniofacial skeleton of many vertebrates. Some vertebrates, including all birds and most reptiles, but excluding most mammals, have scleral cartilages as well as scleral ossicles supporting their eyes. The teleost equivalent of these elements has received little attention in the literature. From radiographic and whole-mount analyses of over 400 individuals from 376 teleost species, we conclude that the teleost scleral skeletal elements (ossicles and cartilage) differ significantly from those of reptiles (including birds). Scleral ossicles in teleosts have different developmental origins, different positions within the eyeball, and different relationships with the scleral cartilaginous element than those in reptiles. From whole-mount staining of a growth series of four species of teleost (Danio rerio, Salmo salar, Esox lucius, and Alosa pseudoharengus), we interpret the development of these elements and show that they arise from within an Alcian blue-staining cartilaginous ring that develops around the eye earlier in development. We present possible scenarios on the evolution of these scleral skeletal elements from a common gnathostome ancestor, and consider that teleost scleral skeletal elements may not be homologous to those in reptiles. Our study indicates that homology cannot be assumed for these elements, despite the fact that they share the same name, scleral ossicles.