Glambecker Weg 15a, 13467 Berlin, Germany.
Arthropod Struct Dev. 2017 Mar;46(2):196-214. doi: 10.1016/j.asd.2017.01.001. Epub 2017 Feb 10.
Only few electron microscopic studies exist on the structure of the main eyes (anterior median eyes, AME) of web spiders. The present paper provides details on the anatomy of the AME in the funnel-web spider Agelena labyrinthica. The retina consists of two separate regions with differently arranged photoreceptor cells. Its central part has sensory cells with rhabdomeres on 2, 3, or 4 sides, whereas those of the ventral retina have only two rhabdomeres on opposite sides. In addition, the rhabdomeres of the ventral retina are arranged in a specific way: Whereas in the most ventral part they form long tangential rows, those towards the center are detached and are arranged radially. All sensory cells are wrapped by unpigmented pigment cell processes. In agelenid spiders the axons of the sensory cells exit from the middle of the cell body; their fine structure and course through the eye cup is described in detail. In the central part of the retina efferent nerve fibres were found forming synapses along the distal region of the receptor cells. A muscle is attached laterally to each eye cup that allows mainly rotational movements of the eyes. The optical performance (image resolution) of these main eyes with relatively few visual cells is discussed.
仅有少数关于蛛网蜘蛛主眼（前正中眼，AME）结构的电子显微镜研究。本文详细介绍了漏斗网蜘蛛 Agelena labyrinthica 的 AME 解剖结构。视网膜由两个具有不同排列方式的光感受器细胞的独立区域组成。其中心部分具有具有 2、3 或 4 个侧面的感觉细胞纤毛器，而腹侧视网膜的感觉细胞纤毛器只有两个相对的侧面。此外，腹侧视网膜的纤毛器以特定的方式排列：在最腹侧部分它们形成长的切线排，而朝向中心的纤毛器则分离并呈放射状排列。所有感觉细胞都被没有色素的色素细胞突起包裹。在节肢动物蜘蛛中，感觉细胞的轴突从中部离开细胞体; 详细描述了它们通过眼杯的精细结构和行程。在视网膜的中央部分发现了传出神经纤维，它们在受体细胞的远端区域形成突触。每个眼杯的外侧都附着有一块肌肉，主要允许眼睛的旋转运动。讨论了这些具有相对较少视觉细胞的主眼的光学性能（图像分辨率）。
