tapetum


tapetum
1. In general, any membranous layer or covering. 2. [TA] In neuroanatomy, a thin sheet of fibers in the lateral wall of the temporal and occipital horns of the lateral ventricle, continuous with the corpus callosum. SYN: Fielding membrane, membrana versicolor. 3. A dense layer in the choroidea of the eye of many mammalian species, including the cat and dog but not humans, that forms a discrete or diffuse area of reflective cells, rodlets, and fibers; its strong light-reflecting properties cause the metallic hue and light-glow of such eyes in the dark. [L. tapeta, a carpet]
- t. nigrum SYN: pigmented layer of retina.
- t. oculi SYN: pigmented layer of retina.

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ta·pe·tum tə-'pēt-əm n, pl ta·pe·ta -'pēt-ə
1) any of various membranous layers or areas esp. of the choroid and retina of the eye specif TAPETUM LUCIDUM
2) a layer of nerve fibers derived from the corpus callosum and forming part of the roof of each lateral ventricle of the brain

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n.
1. a layer of specialized reflecting cells in the choroid behind the retina of the eye.
2. a band of nerve fibres that form the roof and wall of the lower posterior part of the corpus callosum.

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ta·pe·tum (tə-peґtəm) pl. tapeґta [L., from Gr. tapētion, dim. of tapēs a carpet, rug] 1. a covering structure, or layer of cells. 2. t. corporis callosi.

Medical dictionary. 2011.

Look at other dictionaries:

  • Tapetum — (Latin for carpet or tapestry) can refer to:* Tapetum (botany) * Tapetum lucidum * Tapetum of corpus callosum …   Wikipedia

  • Tapetum — bezeichnet: die reflektierende Schicht hinter der Netzhaut mancher Tiere, siehe Tapetum lucidum. eine Struktur, in der die Pollen mancher Pflanzen heranreifen, siehe Tapetum (Pflanze). ein Teil des Corpus callosum, siehe Tapetum corporis callosi …   Deutsch Wikipedia

  • tapetum — fascículo de fibras nerviosas desde el cuerpo calloso al lóbulo occipital. Es una prolongación del fórceps posterior del cuerpo calloso [A14.1.09.252] imagen anatómica interactiva [véase http://www.iqb.es/diccio/t/ta.htm#tapetum] Diccionario… …   Diccionario médico

  • TAPETUM — (син. покрышка), тонкий слой волокон, лежащий непосредственно под эпендимой по наружной стенке заднего рога бокового желудочка и продолжающийся на верхне на ружную стенку нижнего рога. Об его происхождении существуют различные мнения: ряд авторов …   Большая медицинская энциклопедия

  • tapetum — 1713, from M.L. tapetum, from L. tapete carpet …   Etymology dictionary

  • Tapetum — Ta*pe tum, n. [NL., from L. tapete a carpet, a tapestry.] (Anat.) An area in the pigmented layer of the choroid coat of the eye in many animals, which has an iridescent or metallic luster and helps to make the eye visible in the dark. Sometimes… …   The Collaborative International Dictionary of English

  • Tapētum — (lat.), Teppich, T. lucĭdum, s. Auge, S. 104, und Augenleuchten …   Meyers Großes Konversations-Lexikon

  • Tapetum — Tapetum, eine oder mehrere Schichten der Sporangienwand von Farnpflanzen bzw. eine oder zwei Schichten der Pollensackwand von Samenpflanzen. Das T. ernährt die Sporen bzw. Pollenkörner …   Deutsch wörterbuch der biologie

  • tapetum — [tə pēt′əm] n. pl. tapeta [tə pēt′ə] [ModL < L < tapete, a carpet < Gr tapēs: see TAPESTRY] 1. Anat. Zool. any of various membranous layers; esp., a) the iridescent choroid membrane in the eye of certain animals, as the cat b) a layer of …   English World dictionary

  • Tapetum — Ta|pe|tum 〈n.; s; unz.〉 1. 〈Bot.〉 das Archespor umgebende Zellschicht, die der Ernährung der Pollenkörner dient 2. 〈Zool.〉 stark reflektierende Schicht hinter dem lichtempfindlichen Teil des Auges von Nachtraubtieren u. Fischen, die Lichtstrahlen …   Universal-Lexikon

  • Tapetum — Cette page d’homonymie répertorie les différents sujets et articles partageant un même nom. le tapetum est une surface réfléchissante derrière la rétine qui renvoie la lumière et donne un effet d yeux brillants dans l obscurité à certains animaux …   Wikipédia en Français


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