FINE STRUCTURE OF EYES OF ONITHOCHITON-NEGLECTUS (MOLLUSCA - POLYPLACOPHORA)
FINE STRUCTURE OF EYES OF ONITHOCHITON-NEGLECTUS (MOLLUSCA - POLYPLACOPHORA)
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DOI：
10.1007/bf00335443
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发表时间：
1969-01-01
期刊：
影响因子：
--
通讯作者：
BOYLE, PR
中科院分区：
文献类型：
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作者：
BOYLE, PR
常见的滨海石鳖拥有大量嵌入壳外层（即被盖）的小眼睛。它们以明确的模式排列在每个壳阀上。每只眼睛都位于一个口袋中，周围被贝壳中的色素所包围。有一个晶状体、视网膜细胞杯和一个在穿过外壳的视神经管中运行的视神经。存在神经胶质元素。视网膜细胞在中央产生密集的微绒毛阵列，即横纹肌。纤毛存在于横纹肌的边缘；它们具有 9 + 2 的纤毛丝排列，并且似乎不参与微绒毛的形成。眼杯周边的细胞产生大的轮状膜、片状体。这些体源自具有9+2模式的纤毛膜，并形成细胞外空间。视网膜细胞的神经突进入视神经管。根据之前的工作，人们认为片状体也是有感觉的。这些结构与从光感受器描述的其他微绒毛和层状结构有关。
Onithochiton neglectusa common littoral chiton possesses large numbers of small eyes embedded in the outer layer of the shell, the tegmentum. These are arranged in a definite pattern on each shell valve. Each eye lies in a pocket, and is surrounded by pigment laid down in the shell. There is a lens, cup of retina cells and an optic nerve running in an optic canal through the shell. Glial elements are present. The retina cells give rise centrally to a packed array of microvilli, a rhabdom. Cilia are present at the edge of the rhabdom; they have a 9 + 2 arrangement of ciliary filaments and do not appear to be involved in the formation of microvilli. Cells at the periphery of the eye cup give rise to large whorls of membranes, lamellate bodies. These bodies are derived from the membranes of cilia having a 9 + 2 pattern, and form into an extra-cellular space. Nerve processes from the retina cells pass into the optic canal. On the basis of previous work it is thought that the lamellate bodies are also sensory. These structures are discussed in relation to other microvillar and lamellate structures described from photoreceptors.