Scanning electron microscopy of photoreceptor cells in the light- and dark-adapted retina of Haplochromis burtoni (Cichlidae,Teleostei) |
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Authors: | Dr Ilsabe Pietzsch-Rohrschneider |
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Institution: | (1) Department of Anatomy, University of Munich, Munich;(2) Department of Anatomy, University of Kiel, Kiel, Germany;(3) Anatomisches Institut der Universität Kiel, Neue Universität, Eingang F1/F3, 2300 Kiel, Germany |
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Abstract: | Summary The photoreceptor layer in the retina of Haplochromis burtoni (Cichlidae, Teleostei) was studied by scanning electron microscopy. Three types of receptors were identified: rods, single-cones and double-cones. The three-dimensional arrangement of these photoreceptors is described in the light- and dark-adapted retina. The surface of the inner segment of the photoreceptor cells displays fine vertical fissures which give rise to slender processes. These so called calycal processes which are of different lengths in rods and cones, surround the beginning of the smooth-surfaced outer segment. The myoid, the contractile part of the receptor, which is located beneath the ellipsoid, was examined in the single-cones of the dark-adapted retina. It is a slender structure with surface infoldings. The myoid, studied by transmission electron microscopy, contains bundles of parallel myofilaments, which are thought to be contractile.This investigation was supported by grants of the Deutsche Forschungsgemeinschaft (Sonderforschungsbereich 51-E/10) |
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Keywords: | Retina Haplochromis burtoni Photoreceptor cells Light-adaption dark-adaption Scanning electron microscopy |
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