{"id":10637,"date":"2018-01-08T08:00:33","date_gmt":"2018-01-08T07:00:33","guid":{"rendered":"https:\/\/codexvirtualis.fr\/codex\/?p=10637"},"modified":"2018-01-06T18:46:37","modified_gmt":"2018-01-06T17:46:37","slug":"semaine-02-2018","status":"publish","type":"post","link":"https:\/\/codexvirtualis.fr\/codex\/semaine-02-2018","title":{"rendered":"Semaine 02-2018"},"content":{"rendered":"<h2>Une citation<\/h2>\n<p>\u00ab\u00a0Sagesse n&rsquo;entre point en \u00e2me malveillante, et science sans conscience n&rsquo;est que ruine de l&rsquo;\u00e2me.\u00a0\u00bb<\/p>\n<p>F. Rabelais<\/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_34-WEB.jpg\" target=\"_blank\"><img decoding=\"async\" src=\"\/documents\/images\/histologie_articles\/ovaire\/triton_femelle_ovaire_34-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_34_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_34_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 02-2018 r\u00e9sulte de l&rsquo;observation d&rsquo;une coupe histologique \u00e0 l&rsquo;objectif x40 du microscope photonique.<\/p>\n<p>Elle appara\u00eet constitu\u00e9e de quatre unit\u00e9s concentriques ovales, color\u00e9es d&rsquo;autant plus intens\u00e9ment qu&rsquo;elles sont p\u00e9riph\u00e9riques. Il s&rsquo;agit vraisemblablement de structures oblongues coup\u00e9es longitudinalement.<\/p>\n<p> &nbsp; <\/p>\n<p>La structure centrale est nettement d\u00e9limit\u00e9e par une enveloppe de couleur sombre, pr\u00e9sentant des ondulations plus ou moins profondes.<br \/>\nElle contient de nombreuses granulations sombres majoritairement p\u00e9riph\u00e9riques et plus rarement dispers\u00e9es au centre, ainsi que des filaments formant des boucles sym\u00e9triques.<br \/>\nGranulations et filaments sont entour\u00e9s d&rsquo;un fond homog\u00e8ne.<\/p>\n<p> &nbsp; <\/p>\n<p>La premi\u00e8re couche englobant la structure centrale a une organisation h\u00e9t\u00e9rog\u00e8ne, finement granuleuse.<br \/>\nLa seconde est \u00e9galement irr\u00e9guli\u00e8re, constitu\u00e9e de multiples plaquettes ovales relativement volumineuses et d&rsquo;un fond clair.<\/p>\n<p> &nbsp; <\/p>\n<p>La tunique externe est form\u00e9e d&rsquo;une assise de cellules jointives et plates, autour de laquelle des fibres sont pr\u00e9sentes. Elle correspond \u00e0 un <a href=\"\/codex\/glossaire\/glossaire-de-d-a-h#epithelium\" target=\"_blank\">\u00e9pith\u00e9lium<\/a> simple pavimenteux reposant sur du <a href=\"\/codex\/glossaire\/glossaire-de-t-a-z#tissu-conjonctif\" target=\"_blank\">tissu conjonctif<\/a> fibreux.<\/p>\n<p> &nbsp; <\/p>\n<p>La structure centrale poss\u00e8de les caract\u00e9ristiques d&rsquo;un noyau : elle est d\u00e9limit\u00e9e par une enveloppe qualifi\u00e9e de nucl\u00e9aire, contient des granulations, les nucl\u00e9oles, et des filaments, les chromosomes, baignant dans un liquide appel\u00e9 nucl\u00e9oplasme.<br \/>\nCe noyau pr\u00e9sente plusieurs originalit\u00e9s. Ses dimensions sont tr\u00e8s importantes, de l&rsquo;ordre de 210\u00b5m pour la longueur et 150\u00b5m pour la largeur. Ses nucl\u00e9oles sont tr\u00e8s nombreux et principalement distribu\u00e9s en p\u00e9riph\u00e9rie, \u00e0 proximit\u00e9 de l&rsquo;enveloppe nucl\u00e9aire. Ses chromosomes sont en outre bien visibles.<br \/>\nDe telles caract\u00e9ristiques sugg\u00e8rent que le noyau d\u00e9crit est une v\u00e9sicule germinative, terme d\u00e9signant le noyau volumineux des ovocytes I en phase d&rsquo;accroissement.<\/p>\n<p>Les couches entourant le noyau correspondent \u00e0 du cytoplasme. Il est divis\u00e9 en deux zones, p\u00e9rinucl\u00e9aire et p\u00e9riph\u00e9rique, distinctes par la taille des granulations qu&rsquo;elles contiennent. Le cytoplasme p\u00e9rinucl\u00e9aire est finement granuleux alors que le cytoplasme p\u00e9riph\u00e9rique contient des granulations ovales volumineuses. Il s&rsquo;agit de plaquettes vitellines, inclusions compos\u00e9es de r\u00e9serves m\u00e9taboliques.<br \/>\nLa pr\u00e9sence de vitellus est caract\u00e9ristique d&rsquo;un ovocyte I en phase d&rsquo;accroissement. Sa localisation, encore limit\u00e9e au cytoplasme p\u00e9riph\u00e9rique, indique que le d\u00e9p\u00f4t des r\u00e9serves est en cours.<\/p>\n<p>Les tuniques externes sont constitu\u00e9es des cellules folliculaires au contact de l&rsquo;ovocyte, entour\u00e9es d&rsquo;une th\u00e8que interne de nature conjonctive.<\/p>\n<p> &nbsp; <\/p>\n<p>La structure ainsi d\u00e9crite est caract\u00e9ristique d&rsquo;un ovocyte I de Lissamphibien. En l&rsquo;occurrence, il s&rsquo;agit d&rsquo;un ovocyte I d&rsquo;une femelle de Triton.<\/p>\n<p>Elle illustre l&rsquo;ovogen\u00e8se, processus conduisant \u00e0 la formation 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 des animaux.<br \/>\nL&rsquo;ovogen\u00e8se implique une <a href=\"\/codex\/glossaire\/glossaire-de-i-a-o#meiose\" target=\"_blank\">m\u00e9iose<\/a>, succession de deux divisions cellulaires pr\u00e9c\u00e9d\u00e9e d&rsquo;une unique r\u00e9plication du mat\u00e9riel g\u00e9n\u00e9tique. La premi\u00e8re division transforme un ovocyte I diplo\u00efde en ovocyte II haplo\u00efde, et la seconde transforme l&rsquo;ovocyte II en ovotide \u00e9galement haplo\u00efde.<br \/>\nL&rsquo;ovogen\u00e8se comprend aussi un accroissement, pendant lequel des r\u00e9serves informatives et m\u00e9taboliques sont accumul\u00e9es dans l&rsquo;ovocyte.<\/p>\n<p>Chez les Lissamphibiens, l&rsquo;accroissement intervient pendant la premi\u00e8re \u00e9tape de la premi\u00e8re division de m\u00e9iose, appel\u00e9e prophase. Il consiste en la production de nombreux nucl\u00e9oles et ribosomes, la synth\u00e8se d&rsquo;ARN messagers au niveau des boucles des chromosomes, et le d\u00e9p\u00f4t de vitellus dont les mol\u00e9cules constitutives sont produites par divers organes maternels et notamment le foie.<\/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\u00a0Sagesse n&rsquo;entre point en \u00e2me malveillante, et science sans conscience n&rsquo;est que ruine de l&rsquo;\u00e2me.\u00a0\u00bb F. Rabelais &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 02-2018 r\u00e9sulte de l&rsquo;observation d&rsquo;une coupe histologique \u00e0 l&rsquo;objectif x40 du microscope photonique. Elle appara\u00eet constitu\u00e9e de [&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-10637","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=\"Ovocyte I de Triton en phase d&#039;accroissement (vitellogen\u00e8se) avec v\u00e9sicule germinative, nucl\u00e9oles, chromosomes portant des boucles, plaquettes vitellines\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"S. 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