{"id":10684,"date":"2018-01-29T08:00:25","date_gmt":"2018-01-29T07:00:25","guid":{"rendered":"https:\/\/codexvirtualis.fr\/codex\/?p=10684"},"modified":"2018-01-28T15:58:19","modified_gmt":"2018-01-28T14:58:19","slug":"semaine-05-2018","status":"publish","type":"post","link":"https:\/\/codexvirtualis.fr\/codex\/semaine-05-2018","title":{"rendered":"Semaine 05-2018"},"content":{"rendered":"<h2>Une citation<\/h2>\n<p>\u00ab\u00a0Ce n&rsquo;est pas assez d&rsquo;avoir l&rsquo;esprit bon, mais le principal est de l&rsquo;appliquer bien.\u00a0\u00bb<\/p>\n<p>R. Descartes<\/p>\n<p> &nbsp; <\/p>\n<h2>Une image<\/h2>\n<figure style=\"width: 300px\" class=\"wp-caption alignnone\"><a rel=\"lightbox\" href=\"\/documents\/images\/histologie_articles\/ovaire\/triton_femelle_ovaire_17-WEB.jpg\" target=\"_blank\"><img decoding=\"async\" src=\"\/documents\/images\/histologie_articles\/ovaire\/triton_femelle_ovaire_17-WEB.jpg\" width=\"300\" alt=\"Quel est cet organe ?\" class=\"size-medium\" \/><\/a><figcaption class=\"wp-caption-text\">Quel est cet organe ?<\/figcaption><\/figure>\n<p> &nbsp; <\/p>\n<p style=\"text-align: right;\"><a rel=\"lightbox\" href=\"\/images\/albums\/delices-histologiques\/lissamphibien\/ovaire\/triton_femelle_ovaire_17_zp.jpg\" target=\"_blank\">Voir l&rsquo;image de plus grande taille<\/a><\/p>\n<p> &nbsp; <\/p>\n<p style=\"text-align: right;\"><a rel=\"lightbox\" href=\"\/documents\/images\/histologie_articles\/ovaire\/triton_femelle_ovaire_17_legende.jpg\" target=\"_blank\">Voir l&rsquo;image l\u00e9gend\u00e9e<\/a><\/p>\n<p> &nbsp; <\/p>\n<p>L&rsquo;image de la semaine 05-2018 r\u00e9sulte de l&rsquo;observation d&rsquo;une coupe histologique \u00e0 l&rsquo;objectif x40 du microscope photonique.<\/p>\n<p>Elle est constitu\u00e9e de deux unit\u00e9s l\u00e9g\u00e8rement poly\u00e9driques et fonc\u00e9es, contenant chacune une volumineuse structure circulaire plus claire et h\u00e9t\u00e9rog\u00e8ne. Elles sont toutes deux entour\u00e9es d&rsquo;une enveloppe fibreuse. <\/p>\n<p> &nbsp; <\/p>\n<p>Les deux unit\u00e9s correspondent \u00e0 des cellules, dont les noyaux sont repr\u00e9sent\u00e9s par les structures circulaires claires et les cytoplasmes par la masse dense et finement ponctu\u00e9e les environnant.<\/p>\n<p>Les diam\u00e8tres de ces cellules sont de l&rsquo;ordre de 85 et 130 \u00b5m. Ils sont relativement importants.<\/p>\n<p>Leurs noyaux comportent des filaments, formant des amas ou des fibres visibles, ainsi que de petites sph\u00e8res dispers\u00e9es en p\u00e9riph\u00e9rie.<br \/>\nLes filaments correspondent \u00e0 des chromosomes agglom\u00e9r\u00e9s ou distribu\u00e9s de mani\u00e8re diffuse. Leur pr\u00e9sence indique que les cellules sont en p\u00e9riode de division.<br \/>\nLes sph\u00e8res sont des nucl\u00e9oles. Leur nombre \u00e9lev\u00e9 et leur localisation p\u00e9rinucl\u00e9aire r\u00e9v\u00e8lent que les noyaux qui les contiennent sont des v\u00e9sicules germinatives et les cellules des ovocytes I en prophase de premi\u00e8re division de m\u00e9iose.<\/p>\n<p>Le cytoplasme est assez peu abondant et finement granuleux. Pauvre en r\u00e9serves, il sugg\u00e8re que les ovocytes observ\u00e9s sont en d\u00e9but de vitellogen\u00e8se.<\/p>\n<p> &nbsp; <\/p>\n<p>La tunique fibreuse entourant les ovocytes appara\u00eet form\u00e9e de cellules plates accol\u00e9es aux ovocytes, de <a href=\"\/codex\/glossaire\/glossaire-de-t-a-z#tissu-conjonctif\" target=\"_blank\">tissu conjonctif<\/a> fibreux, ainsi que d&rsquo;une enveloppe externe de cellules plates situ\u00e9es au contact d&rsquo;une lumi\u00e8re.<\/p>\n<p>Les cellules accol\u00e9es aux ovocytes sont des cellules folliculaires et le tissu conjonctif fibreux constitue une th\u00e8que.<br \/>\nL&rsquo;enveloppe externe correspond \u00e0 un <a href=\"\/codex\/glossaire\/glossaire-de-d-a-h#epithelium\" target=\"_blank\">\u00e9pith\u00e9lium<\/a> ovarien interne d\u00e9limitant une cavit\u00e9 ovarienne. <\/p>\n<p>Un tel agencement est caract\u00e9ristique des ovaires creux des Vert\u00e9br\u00e9s. En l&rsquo;occurrence, la coupe histologique est confectionn\u00e9e dans l&rsquo;ovaire d&rsquo;un Lissamphibien, le Triton, dont l&rsquo;organisation est d\u00e9crite dans l&rsquo;article de la <a href=\"\/codex\/semaine-04-2018\">semaine 04-2018<\/a> de Codex virtualis.<\/p>\n<p> &nbsp; <\/p>\n<p>Les ovaires, gonades femelles, sont le si\u00e8ge de la production des <a href=\"\/codex\/glossaire\/glossaire-de-i-a-o#ovule\" target=\"_blank\">ovules<\/a>, <a href=\"\/codex\/glossaire\/glossaire-de-d-a-h#gamete\" target=\"_blank\">gam\u00e8tes<\/a> femelles, processus appel\u00e9 ovogen\u00e8se.<\/p>\n<p>Les cellules germinales \u00e0 l&rsquo;origine des ovules sont dites ovogonies. Leur multiplication produit des ovocytes I, qui s&rsquo;engagent dans la transformation en ovules.<br \/>\nIls subissent une <a href=\"\/codex\/glossaire\/glossaire-de-i-a-o#meiose\" target=\"_blank\">m\u00e9iose<\/a>, comportant deux divisions cellulaires. La premi\u00e8re division de m\u00e9iose conduit \u00e0 des ovocytes II et la seconde \u00e0 des ovotides.<br \/>\nLa m\u00e9iose \u00e9tant pr\u00e9c\u00e9d\u00e9e d&rsquo;une seule duplication du mat\u00e9riel g\u00e9n\u00e9tique, les cellules qui la subissent voient la quantit\u00e9 de leur mat\u00e9riel g\u00e9n\u00e9tique et le nombre de leurs chromosomes divis\u00e9s par deux : de diplo\u00efdes, elles deviennent haplo\u00efdes.<\/p>\n<p>Dans le cas de l&rsquo;ovogen\u00e8se, chez les Lissamphibiens notamment, l&rsquo;\u00e9volution nucl\u00e9aire des cellules germinales femelles est accompagn\u00e9e d&rsquo;une \u00e9volution cytoplasmique : des r\u00e9serves m\u00e9taboliques et informationnelles sont accumul\u00e9es dans le cytoplasme, processus appel\u00e9 vitellogen\u00e8se.<br \/>\nElle se produit \u00e0 la fin de la prophase de premi\u00e8re division de m\u00e9iose, principalement lors de la phase dite diplot\u00e8ne.<br \/>\nL&rsquo;ovocyte situ\u00e9 dans la partie inf\u00e9rieure de l&rsquo;image a vraisemblablement atteint le d\u00e9but de la phase diplot\u00e8ne tandis que l&rsquo;ovocyte localis\u00e9 dans la partie sup\u00e9rieure de l&rsquo;image est en fin de phase pachyt\u00e8ne, pr\u00e9c\u00e9dant la phase diplot\u00e8ne.<\/p>\n<p>L&rsquo;organisation des ovocytes de Triton en vitellogen\u00e8se est d\u00e9crite dans les articles des semaines <a href=\"\/codex\/semaine-02-2018\">02-2018<\/a> et <a href=\"\/codex\/semaine-03-2018\">03-2018<\/a>.<\/p>\n<p> &nbsp; <\/p>\n<p>Pour en savoir plus, consulter :<\/p>\n<p><span style=\"color: #999999;\">&bull; <\/span>les pages <a href=\"\/codex\/de-lorganisation-interne\/premiers-pas-histologiques\">Premiers pas histologiques<\/a> de Codex virtualis (adresse : http:\/\/codexvirtualis.fr\/codex\/de-lorganisation-interne\/premiers-pas-histologiques)<\/p>\n<p><span style=\"color: #999999;\">&bull; <\/span> Burkitt H.G., Young B., Heath J.W., 1993 \u2013 Histologie fonctionnelle Wheater. Arnette, 408p. Paris<\/p>\n<p><span style=\"color: #999999;\">&bull; <\/span>Heusser S., Dupuy H.G., 2015 \u2013 Atlas biologie animale. Dunod, 220p. Paris<\/p>\n<p> &nbsp; <\/p>\n<hr \/>\n","protected":false},"excerpt":{"rendered":"<p>Une citation \u00ab\u00a0Ce n&rsquo;est pas assez d&rsquo;avoir l&rsquo;esprit bon, mais le principal est de l&rsquo;appliquer bien.\u00a0\u00bb R. Descartes &nbsp; Une image &nbsp; Voir l&rsquo;image de plus grande taille &nbsp; Voir l&rsquo;image l\u00e9gend\u00e9e &nbsp; L&rsquo;image de la semaine 05-2018 r\u00e9sulte de l&rsquo;observation d&rsquo;une coupe histologique \u00e0 l&rsquo;objectif x40 du microscope photonique. Elle est constitu\u00e9e de deux [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":"","jetpack_post_was_ever_published":false},"categories":[1],"tags":[10,14,23,22],"class_list":["post-10684","post","type-post","status-publish","format-standard","hentry","category-a-la-une","tag-amphibien","tag-histologie","tag-observation","tag-physiologie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"Ovocytes I d&#039;ovaire de Triton \u00e0 diff\u00e9rents stades de la phase d&#039;accroissement (pr\u00e9vitellogen\u00e8se et vitellogen\u00e8se) avec v\u00e9sicule germinative, th\u00e8que et cavit\u00e9 ovariennes\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"S. 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