The term refers to the sensory organs in animals that receive light stimuli, but may exclude those that cannot see form, such as the scattered cutaneous photoreceptor. Eyes are broadly divided into the median eye, located on or near the midline of the body, and the lateral eyes, located on both sides of the body. The parietal eye of reptiles and cyclostomes and the dorsal ocelli of adult insects are median eyes. [Animal eyes] [Invertebrates] The structure and function of the eyes of invertebrates vary greatly depending on the species. The most primitive type is the light-sensitive eyespot found in the single-celled protozoan Euglena. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
動物における光刺激を受容する感覚器官をいうが,散在皮膚光覚器のように,形態視ができないものは除く場合がある。目は,体の正中線またはその近くにある中央眼と体の両側方にある側眼に大別される。爬虫類や円口類の顱頂眼(ろちようがん)や昆虫成虫の背単眼が中央眼である。 【動物の目】 [無脊椎動物] 無脊椎動物の目の構造や機能は,種類によって大きく異なっている。最も原始的なものは,単細胞生物である原生動物のミドリムシにみられる感光性の細胞小器官の眼点である。 出典 株式会社平凡社世界大百科事典 第2版について 情報 |
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