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- Cephalopod_eye abstract "Cephalopods, as active marine predators, possess sensory organs specialized for use in aquatic conditions. They have a camera-type eye which consists of an iris, a circular lens, vitreous cavity (eye gel), pigment cells, and photoreceptor cells that translate light from the light-sensitive retina into nerve signals which travel along the optic nerve to the brain. For the past 140 years, the camera-type cephalopod eye has been compared with the vertebrate eye as an example of convergent evolution, where both types of organisms have independently evolved the camera-eye trait and both share similar functionality. Contention exists on whether this is truly convergent evolution or parallel evolution. Unlike the vertebrate camera eye, the cephalopods' form as invaginations of the body surface (rather than outgrowths of the brain), and consequently they lack a cornea. Unlike the vertebrate eye, a cephalopod eye is focused through movement, much like the lens of a camera or telescope, rather than changing shape as the lens in the human eye does. The eye is approximately spherical, as is the lens, which is fully internal.The crystalins used in the lens appear to have developed independently from vertebrate crystalins, suggesting a homoplasious origin of the lens.Most cephalopods possess complex extraocular muscle systems that allow for very fine control over the gross positioning of the eyes. Octopuses possess an autonomic response that maintains the orientation of their pupils such that they are always horizontal.".
- Cephalopod_eye thumbnail Evolution_eye.svg?width=300.
- Cephalopod_eye wikiPageID "21423322".
- Cephalopod_eye wikiPageLength "10488".
- Cephalopod_eye wikiPageOutDegree "43".
- Cephalopod_eye wikiPageRevisionID "678432150".
- Cephalopod_eye wikiPageWikiLink Autonomic_nervous_system.
- Cephalopod_eye wikiPageWikiLink Bathyteuthis.
- Cephalopod_eye wikiPageWikiLink Bilateria.
- Cephalopod_eye wikiPageWikiLink Blind_spot_(vision).
- Cephalopod_eye wikiPageWikiLink Camera-type_eye.
- Cephalopod_eye wikiPageWikiLink Category:Cephalopod_zootomy.
- Cephalopod_eye wikiPageWikiLink Category:Vision_by_taxon.
- Cephalopod_eye wikiPageWikiLink Cephalopod.
- Cephalopod_eye wikiPageWikiLink Cephalopods.
- Cephalopod_eye wikiPageWikiLink Chambered_nautilus.
- Cephalopod_eye wikiPageWikiLink Common_octopus.
- Cephalopod_eye wikiPageWikiLink Convergent_evolution.
- Cephalopod_eye wikiPageWikiLink Cornea.
- Cephalopod_eye wikiPageWikiLink Crystalin.
- Cephalopod_eye wikiPageWikiLink Crystallin.
- Cephalopod_eye wikiPageWikiLink Cuttlefish.
- Cephalopod_eye wikiPageWikiLink Drosophila.
- Cephalopod_eye wikiPageWikiLink Evolution_of_the_eye.
- Cephalopod_eye wikiPageWikiLink Eye.
- Cephalopod_eye wikiPageWikiLink Eye_development.
- Cephalopod_eye wikiPageWikiLink Eye_disease.
- Cephalopod_eye wikiPageWikiLink Gene_expression.
- Cephalopod_eye wikiPageWikiLink Invagination.
- Cephalopod_eye wikiPageWikiLink Lens_(anatomy).
- Cephalopod_eye wikiPageWikiLink Mollusc_eye.
- Cephalopod_eye wikiPageWikiLink Natural_selection.
- Cephalopod_eye wikiPageWikiLink Nautilus_pompilius.
- Cephalopod_eye wikiPageWikiLink Octopus.
- Cephalopod_eye wikiPageWikiLink Octopus_vulgaris.
- Cephalopod_eye wikiPageWikiLink Ocular_disease.
- Cephalopod_eye wikiPageWikiLink Orthogonal.
- Cephalopod_eye wikiPageWikiLink Orthogonality.
- Cephalopod_eye wikiPageWikiLink PAX6.
- Cephalopod_eye wikiPageWikiLink Parallel_evolution.
- Cephalopod_eye wikiPageWikiLink Pax6.
- Cephalopod_eye wikiPageWikiLink Photoreceptor_cell.
- Cephalopod_eye wikiPageWikiLink Polarization_(waves).
- Cephalopod_eye wikiPageWikiLink Polarized_light.
- Cephalopod_eye wikiPageWikiLink Retina.
- Cephalopod_eye wikiPageWikiLink Squid.
- Cephalopod_eye wikiPageWikiLink Vertebrate.
- Cephalopod_eye wikiPageWikiLinkText "Cephalopod eye".
- Cephalopod_eye wikiPageWikiLinkText "camera eye".
- Cephalopod_eye wikiPageWikiLinkText "camera eyes of cephalopod".
- Cephalopod_eye wikiPageWikiLinkText "cephalopod eye".
- Cephalopod_eye wikiPageWikiLinkText "eye".
- Cephalopod_eye wikiPageWikiLinkText "eyeball".
- Cephalopod_eye wikiPageWikiLinkText "eyes".
- Cephalopod_eye wikiPageWikiLinkText "octopus eyes".
- Cephalopod_eye caption "In vertebrate eyes, the nerve fibers route before the retina, blocking some light and creating a blind spot where the fibers pass through the retina. In cephalopod eyes, the nerve fibers route behind the retina, and do not block light or disrupt the retina. 4 denotes the vertebrate blind spot. In vertebrates, 1 denotes the retina and 2 the nerve fibers, whereas in cephalopods, it is opposite. 3 is the optic nerve.".
- Cephalopod_eye float "right".
- Cephalopod_eye hasPhotoCollection Cephalopod_eye.
- Cephalopod_eye height "250".
- Cephalopod_eye imageLeft "0".
- Cephalopod_eye imageTop "0".
- Cephalopod_eye imageWidth "400".
- Cephalopod_eye width "400".
- Cephalopod_eye wikiPageUsesTemplate Template:Annotated_image.
- Cephalopod_eye wikiPageUsesTemplate Template:Cephalopod_anatomy.
- Cephalopod_eye wikiPageUsesTemplate Template:Reflist.
- Cephalopod_eye wikiPageUsesTemplate Template:Vision_in_animals.
- Cephalopod_eye wikiPageUsesTemplate Template:Wikipedia_books.
- Cephalopod_eye subject Category:Cephalopod_zootomy.
- Cephalopod_eye subject Category:Vision_by_taxon.
- Cephalopod_eye comment "Cephalopods, as active marine predators, possess sensory organs specialized for use in aquatic conditions. They have a camera-type eye which consists of an iris, a circular lens, vitreous cavity (eye gel), pigment cells, and photoreceptor cells that translate light from the light-sensitive retina into nerve signals which travel along the optic nerve to the brain.".
- Cephalopod_eye label "Cephalopod eye".
- Cephalopod_eye sameAs Ojo_de_los_cefalópodos.
- Cephalopod_eye sameAs Oko_głowonogów.
- Cephalopod_eye sameAs m.05f6612.
- Cephalopod_eye sameAs Q5063316.
- Cephalopod_eye sameAs Q5063316.
- Cephalopod_eye wasDerivedFrom Cephalopod_eye?oldid=678432150.
- Cephalopod_eye depiction Evolution_eye.svg.
- Cephalopod_eye isPrimaryTopicOf Cephalopod_eye.