{"id":10691,"date":"2018-02-12T08:00:08","date_gmt":"2018-02-12T07:00:08","guid":{"rendered":"https:\/\/codexvirtualis.fr\/codex\/?p=10691"},"modified":"2018-02-11T12:21:35","modified_gmt":"2018-02-11T11:21:35","slug":"semaine-07-2018","status":"publish","type":"post","link":"https:\/\/codexvirtualis.fr\/codex\/semaine-07-2018","title":{"rendered":"Semaine 07-2018"},"content":{"rendered":"<h2>Une citation<\/h2>\n<p>\u00ab\u00a0Exiger de soi le meilleur est \u00e0 la port\u00e9e de tous.\u00a0\u00bb<\/p>\n<p>A. Jollien<\/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\/ovaire_tetard_01-WEB.jpg\" target=\"_blank\"><img decoding=\"async\" src=\"\/documents\/images\/histologie_articles\/ovaire\/ovaire_tetard_01-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-larve\/ovaire\/ovaire_tetard_01_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\/ovaire_tetard_01_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 07-2018 est issue de l&rsquo;observation d&rsquo;une coupe histologique \u00e0 l&rsquo;objectif x100 du microscope photonique.<\/p>\n<p>Elle appara\u00eet form\u00e9e de groupes d&rsquo;unit\u00e9s circulaires de structures similaires : elles renferment une r\u00e9gion ronde contenant des filaments, dont l&rsquo;\u00e9paisseur et l&rsquo;agencement diff\u00e8rent selon le groupe auquel elles appartiennent.<\/p>\n<p> &nbsp; <\/p>\n<p>Les unit\u00e9s circulaires regroup\u00e9es ont un diam\u00e8tre de l&rsquo;ordre de 20 \u00b5m. Il s&rsquo;agit de cellules animales. La structure ronde qu&rsquo;elles contiennent correspond \u00e0 un noyau et les filaments \u00e0 des chromosomes.<\/p>\n<p>La pr\u00e9sence de chromosomes dans les noyaux est caract\u00e9ristique de cellules en division.<br \/>\nEn l&rsquo;occurrence, la diversit\u00e9 des aspects des chromosomes en termes d&rsquo;\u00e9paisseurs et de distribution indique que les cellules sont en prophase de premi\u00e8re division de <a href=\"\/codex\/glossaire\/glossaire-de-i-a-o#meiose\" target=\"_blank\">m\u00e9iose<\/a>. <\/p>\n<p>L&rsquo;organisation des cellules en petits groupes isol\u00e9s par du <a href=\"\/codex\/glossaire\/glossaire-de-t-a-z#tissu-conjonctif\" target=\"_blank\">tissu conjonctif<\/a> fibreux ainsi que leur association avec des cellules plates, qualifi\u00e9es de folliculaires, r\u00e9v\u00e8lent que l&rsquo;organe est un ovaire, et les cellules en m\u00e9iose sont des ovocytes I. <\/p>\n<p>L&rsquo;existence de globules rouges, ou \u00e9rythrocytes, nucl\u00e9\u00e9s dans les vaisseaux sanguins <a href=\"\/codex\/glossaire\/glossaire-de-a-a-c#capillaire\" target=\"_blank\">capillaires<\/a> sugg\u00e8re que la coupe est confectionn\u00e9e dans un ovaire de Vert\u00e9br\u00e9 non mammalien. Il s&rsquo;agit d&rsquo;une Grenouille en cours de m\u00e9tamorphose.<\/p>\n<p>La structure g\u00e9n\u00e9rale de l&rsquo;ovaire de Grenouille en cours de m\u00e9tamorphose est d\u00e9crite dans l&rsquo;article de la <a href=\"\/codex\/semaine-06-2018\">semaine 06-2018<\/a> de Codex virtualis.<\/p>\n<p> &nbsp; <\/p>\n<p>La m\u00e9iose est un processus intervenant pendant la formation des <a href=\"\/codex\/glossaire\/glossaire-de-d-a-h#gamete\" target=\"_blank\">gam\u00e8tes<\/a>, cellules sexuelles haplo\u00efdes impliqu\u00e9es dans la reproduction sexu\u00e9e. Pr\u00e9c\u00e9d\u00e9e d&rsquo;une unique r\u00e9plication du mat\u00e9riel g\u00e9n\u00e9tique, elle comporte deux divisions cellulaires successives. <\/p>\n<p>Par la premi\u00e8re division de m\u00e9iose, chaque cellule fille re\u00e7oit l&rsquo;un des chromosomes de chaque paire de chromosomes homologues de la cellule m\u00e8re.<\/p>\n<p>Par la seconde division de m\u00e9iose, chaque cellule \u00ab\u00a0petite fille\u00a0\u00bb re\u00e7oit l&rsquo;une des chromatides de chaque chromosome de la cellule fille lui ayant donn\u00e9 naissance. <\/p>\n<p>Chaque division cellulaire comprend quatre phases successives appel\u00e9es prophase, m\u00e9taphase, anaphase et t\u00e9lophase. <\/p>\n<p>Les cellules dont le noyau contient de fins filaments enchev\u00eatr\u00e9s dont les extr\u00e9mit\u00e9s sont reli\u00e9es \u00e0 la face interne de l&rsquo;enveloppe nucl\u00e9aire, correspondant \u00e0 des chromosomes en cours de condensation, sont des ovocytes I d\u00e9butant la prophase de premi\u00e8re division de m\u00e9iose, \u00e9tape d\u00e9sign\u00e9e par l&rsquo;expression stade leptot\u00e8ne.<\/p>\n<p>Les cellules poss\u00e9dant des filaments plus \u00e9pais, aux extr\u00e9mit\u00e9s accol\u00e9es \u00e0 la face interne de l&rsquo;enveloppe nucl\u00e9aire et repli\u00e9s en boucles, repr\u00e9sentant des chromosomes assembl\u00e9s par paires et agenc\u00e9s en bouquets, sont des ovocytes I parvenus au stade zygot\u00e8ne de la prophase de premi\u00e8re division de m\u00e9iose.<\/p>\n<p>Les cellules dont les noyaux ne contiennent pas de filaments nettement visibles mais plusieurs petites taches p\u00e9riph\u00e9riques intens\u00e9ment color\u00e9es, correspondant \u00e0 des nucl\u00e9oles, sont des ovocytes I ayant atteint le dernier stade de la prophase de premi\u00e8re division de m\u00e9iose, appel\u00e9 diplot\u00e8ne.<br \/>\nLeur \u00e9volution est d\u00e9crite dans les articles des semaines <a href=\"\/codex\/semaine-02-2018\">02-2018<\/a>, <a href=\"\/codex\/semaine-03-2018\">03-2018<\/a>, <a href=\"\/codex\/semaine-04-2018\">04-2018<\/a> et <a href=\"\/codex\/semaine-05-2018\">05-2018<\/a>. <\/p>\n<p> &nbsp; <\/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\u00a0Exiger de soi le meilleur est \u00e0 la port\u00e9e de tous.\u00a0\u00bb A. Jollien &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 07-2018 est issue de l&rsquo;observation d&rsquo;une coupe histologique \u00e0 l&rsquo;objectif x100 du microscope photonique. Elle appara\u00eet form\u00e9e de groupes d&rsquo;unit\u00e9s circulaires [&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-10691","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=\"R\u00e9gion corticale d&#039;ovaire creux de Grenouille au climax de la m\u00e9tamorphose avec ovogonies et ovocytes en prophase de premi\u00e8re division de m\u00e9iose (stades leptot\u00e8ne, zygot\u00e8ne et diplot\u00e8ne), cellules folliculaires et tissu conjonctif fibreux\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"S. 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