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A lambda-shaped retractor lentis muscle in the yellowfin goby Acanthogobius flavimanus |
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| Authors: | Taeko Miyazaki Akari Kato Takanori Ikenaga Hanako Hagio Naoyuki Yamamoto |
| Institution: | 1. Department of Marine Bioresources, Graduate School of Bioresources, Mie University, 1577 Kurimamachiya, Tsu, Mie, Japan;2. Department of Chemistry and Bioscience, Graduate School of Science and Engineering, Kagoshima University, 1-21-24 Korimoto, Kagoshima, Japan;3. Department of Marine Bioresources, Graduate School of Bioresources, Mie University, 1577 Kurimamachiya, Tsu, Mie, Japan
Department of Animal Sciences, Graduate School of Bioagricultural Sciences, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Japan;4. Department of Animal Sciences, Graduate School of Bioagricultural Sciences, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Japan |
| Abstract: | We identified a morphologically uncommon piscine retractor lentis muscle in the yellowfin goby Acanthogobius flavimanus. This lentis muscle has a shape similar to the Greek small letter lambda (λ). The two legs of the muscle are attached to the retinal periphery at the ventral eyecup, while the tip is connected to the lens surface by a ligament. Scanning electron microscopy showed that the fibers of the lentis muscle run along the length of both the anterior and posterior legs. Immunolabeling with antiacetylated tubulin antibody and neuronal tracing with DiI of the whole lentis muscle revealed that the anterior leg is innervated by one or more nerves. The topographic distribution of ganglion cells in the retina was investigated to identify the visual axis. Three high cell density areas were observed in the dorso-temporal, ventro-nasals and ventro-temporal retina. These findings suggest that the λ-shaped lentis muscle may enable accommodatory movement of the lens toward the temporal as well as the nasal and/or ventral retina. |
| Keywords: | fish eye multiple focusing |