Sturgeons, sharks, and rays have multifocal crystalline lenses and similar lens suspension apparatuses
Identifieur interne : 000A47 ( Istex/Corpus ); précédent : 000A46; suivant : 000A48Sturgeons, sharks, and rays have multifocal crystalline lenses and similar lens suspension apparatuses
Auteurs : Ola S. E. Gustafsson ; Peter Ekström ; Ronald H. H. KrögerSource :
- Journal of Morphology [ 0362-2525 ] ; 2012-07.
English descriptors
- KwdEn :
Abstract
Crystalline lenses with multiple focal lengths in monochromatic light (multifocal lenses) are present in many vertebrate groups. These lenses compensate for chromatic aberration and create well‐focused color images. Stabilization of the lens within the eye and the ability to adjust focus are further requirements for vision in high detail. We investigated the occurrence of multifocal lenses by photorefractometry and lens suspension structures by light and electron microscopy in sturgeons (Acipenseriformes, Chondrostei) as well as sharks and rays (Elasmobranchii, Chondrichthyes). Multifocal lenses were found in two more major vertebrate groups, the Chondrostei represented by Acipenseriformes and Chondrichthyes represented by Elasmobranchii. The lens suspension structures of sturgeons, sharks, and rays are more complex than described previously. The lens is suspended by many delicate suspensory fibers in association with a ventral papilla in all groups studied. The arrangements of the suspensory fibers are most similar between sturgeons and sharks. In rays, the lens is suspended by a smaller ventral papilla and the suspensory fibers are arranged more concentrically to the lens. J. Morphol., 2012. © 2012 Wiley Periodicals, Inc.
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DOI: 10.1002/jmor.20020
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ISTEX:FD60FBFB4DFE1F782C1A8C6A8ABF63E933A8BC7DLe document en format XML
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Gustafsson</name><affiliation><mods:affiliation>Department of Biology, Lund University, Sölvegatan 35, 223 62 Lund, Sweden</mods:affiliation></affiliation><affiliation><mods:affiliation>Department of Biology, Lund University, Biology Building, Sölvegatan 35, 223 62 Lund, Sweden</mods:affiliation></affiliation></author><author><name sortKey="Ekstrom, Peter" sort="Ekstrom, Peter" uniqKey="Ekstrom P" first="Peter" last="Ekström">Peter Ekström</name><affiliation><mods:affiliation>Department of Biology, Lund University, Sölvegatan 35, 223 62 Lund, Sweden</mods:affiliation></affiliation></author><author><name sortKey="Kroger, Ronald H H" sort="Kroger, Ronald H H" uniqKey="Kroger R" first="Ronald H. H." last="Kröger">Ronald H. H. 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These lenses compensate for chromatic aberration and create well‐focused color images. Stabilization of the lens within the eye and the ability to adjust focus are further requirements for vision in high detail. We investigated the occurrence of multifocal lenses by photorefractometry and lens suspension structures by light and electron microscopy in sturgeons (Acipenseriformes, Chondrostei) as well as sharks and rays (Elasmobranchii, Chondrichthyes). Multifocal lenses were found in two more major vertebrate groups, the Chondrostei represented by Acipenseriformes and Chondrichthyes represented by Elasmobranchii. The lens suspension structures of sturgeons, sharks, and rays are more complex than described previously. The lens is suspended by many delicate suspensory fibers in association with a ventral papilla in all groups studied. The arrangements of the suspensory fibers are most similar between sturgeons and sharks. In rays, the lens is suspended by a smaller ventral papilla and the suspensory fibers are arranged more concentrically to the lens. J. Morphol., 2012. © 2012 Wiley Periodicals, Inc.</div></front></TEI><istex><corpusName>wiley</corpusName><author><json:item><name>Ola S.E. Gustafsson</name><affiliations><json:string>Department of Biology, Lund University, Sölvegatan 35, 223 62 Lund, Sweden</json:string><json:string>Department of Biology, Lund University, Biology Building, Sölvegatan 35, 223 62 Lund, Sweden</json:string></affiliations></json:item><json:item><name>Peter Ekström</name><affiliations><json:string>Department of Biology, Lund University, Sölvegatan 35, 223 62 Lund, Sweden</json:string></affiliations></json:item><json:item><name>Ronald H.H. 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These lenses compensate for chromatic aberration and create well‐focused color images. Stabilization of the lens within the eye and the ability to adjust focus are further requirements for vision in high detail. We investigated the occurrence of multifocal lenses by photorefractometry and lens suspension structures by light and electron microscopy in sturgeons (Acipenseriformes, Chondrostei) as well as sharks and rays (Elasmobranchii, Chondrichthyes). Multifocal lenses were found in two more major vertebrate groups, the Chondrostei represented by Acipenseriformes and Chondrichthyes represented by Elasmobranchii. The lens suspension structures of sturgeons, sharks, and rays are more complex than described previously. The lens is suspended by many delicate suspensory fibers in association with a ventral papilla in all groups studied. The arrangements of the suspensory fibers are most similar between sturgeons and sharks. 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In rays, the lens is suspended by a smaller ventral papilla and the suspensory fibers are arranged more concentrically to the lens. J. Morphol., 2012. © 2012 Wiley Periodicals, Inc.</abstract><subject lang="en"><genre>keywords</genre><topic>lens</topic><topic>suspension</topic><topic>multifocal</topic><topic>evolution</topic><topic>camera eye</topic></subject><relatedItem type="host"><titleInfo><title>Journal of Morphology</title></titleInfo><titleInfo type="abbreviated"><title>J. 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