Topographic analysis of the ganglion cell layer in the retina of the four-eyed fishAnableps anableps
| Autor: | Alexandre Motta Bittencourt, Luciano Fogaça de Assis Montag, Francisco Gilberto Oliveira, Valéria de Albuquerque Oliveira, Belmira Lara da Silveira Andrade da Costa, Elizabeth Sumi Yamada, João Paulo Coimbra, Francyllena L. Nascimento, Valdir Luna da Silva, Diógenes Luís da Mota |
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| Rok vydání: | 2006 |
| Předmět: |
Retinal Ganglion Cells
Retina genetic structures Physiology Cell Count Retinal Anatomy Biology biology.organism_classification Four-eyed fish eye diseases Sensory Systems Ganglion Visual field Cyprinodontiformes chemistry.chemical_compound medicine.anatomical_structure chemistry medicine Animals Ganglion cell layer Anableps anableps Cell Size |
| Zdroj: | Visual Neuroscience. 23:879-886 |
| ISSN: | 1469-8714 0952-5238 |
| DOI: | 10.1017/s0952523806230232 |
| Popis: | Fish of the genusAnableps(Anablepidae, Cyprinodontiformes) have eyes that are adapted for simultaneous aerial and aquatic vision. In this study we investigate some of the corresponding retinal specializations of the adultAnableps anablepseye using retinal transverse sections and wholemounts. The linear dimensions of the retina were found to be asymmetric with a greater representation of the dorsal compared to the ventral visual field. The total number of neurons in the ganglion cell layer of the ventral hemiretina was on average 3.6 times greater than the values obtained in the dorsal hemiretina. Isodensity contour maps revealed a prominent horizontal visual streak in the ventral hemiretina with an average peak cell density of 18,286 cells/mm2. A second less-well-developed horizontal visual streak was also observed in the dorsal hemiretina. A sub-population of large cells with soma areas between 74 and 188 μm2was identified and found to be distributed evenly across both hemiretinas. Together, these results show that the sampling gain of the ventral retina is significantly greater than the dorsal segment, that retinal specializations important for mediating acute vision are present in the parts of the visual field immediately above and below the surface of the water, and that visual functions related with the large ganglion cells require more even sampling across the visual field. The relevance of these retinal specializations to the feeding and other behavioral strategies adopted byAnablepsis discussed. |
| Databáze: | OpenAIRE |
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