{"id":12012,"date":"2019-05-13T08:00:53","date_gmt":"2019-05-13T06:00:53","guid":{"rendered":"https:\/\/codexvirtualis.fr\/codex\/?p=12012"},"modified":"2019-05-16T21:22:37","modified_gmt":"2019-05-16T19:22:37","slug":"semaine-20-2019","status":"publish","type":"post","link":"https:\/\/codexvirtualis.fr\/codex\/semaine-20-2019","title":{"rendered":"Semaine 20-2019"},"content":{"rendered":"<h2>Une citation<\/h2>\n<p>\u00ab\u00a0L&rsquo;homme sans patience est une lampe sans huile.\u00a0\u00bb<\/p>\n<p>A. de Musset<\/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\/nephridie\/lombric_cl_nephridie_13_segment_large_moyen-WEB.jpg\"><img decoding=\"async\" src=\"\/documents\/images\/histologie_articles\/nephridie\/lombric_cl_nephridie_13_segment_large_moyen-WEB\" width=\"300\" \" alt=\"Quel est cet organe ?\" class=\"size-medium\" \/><figcaption class=\"wp-caption-text\">Quel est cet organe ?<\/figcaption><\/figure>\n<p> &nbsp; <\/p>\n<p style=\"text-align: right;\"><a rel=\"lightbox noopener noreferrer\" href=\"\/images\/albums\/delices-histologiques\/annelide-adulte\/appareil-excreteur\/lombric_cl_nephridie_13_segment_large_moyen_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 noopener noreferrer\" href=\"\/documents\/images\/histologie_articles\/nephridie\/lombric_cl_nephridie_13_segment_large_moyen_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 20-2019 provient de l&rsquo;observation d&rsquo;une coupe <\/a><a href=\"\/codex\/glossaire\/glossaire-de-d-a-h#histologique\" target=\"_blank\" rel=\"noopener noreferrer\">histologique<\/a> \u00e0 l&rsquo;objectif x20 du microscope photonique.<\/p>\n<p>Elle comporte une masse centrale baignant dans un espace semblant vide, mais contenant des unit\u00e9s diverses dispers\u00e9es. La masse centrale est elle-m\u00eame creus\u00e9e d&rsquo;une lacune, bord\u00e9e d&rsquo;une paroi relativement \u00e9paisse. Il s&rsquo;agit vraisemblablement d&rsquo;une structure tubuleuse coup\u00e9e transversalement.<\/p>\n<p> &nbsp; <\/p>\n<p>La paroi d\u00e9limitant la lacune appara\u00eet form\u00e9e d&rsquo;unit\u00e9s accol\u00e9es les unes aux autres, agenc\u00e9es en une unique couche. Chacune contient une sous-unit\u00e9s ovale intens\u00e9ment color\u00e9e, entour\u00e9e de mati\u00e8re h\u00e9t\u00e9rog\u00e8ne comprenant de fines et de volumineuses granulations.<\/p>\n<p>Cette organisation est caract\u00e9ristique des <a href=\"\/codex\/glossaire\/glossaire-de-a-a-c#cellule\" target=\"_blank\" rel=\"noopener noreferrer\">cellules<\/a> animales, la sous-unit\u00e9 ovale correspondant au noyau et la mati\u00e8re h\u00e9t\u00e9rog\u00e8ne au <a href=\"\/codex\/glossaire\/glossaire-de-a-a-c#cytoplasme\" target=\"_blank\" rel=\"noopener noreferrer\">cytoplasme<\/a>.<br \/>\nL&rsquo;agencement des cellules en une couche continue d\u00e9termine un <a href=\"\/codex\/glossaire\/glossaire-de-d-a-h#epithelium\" target=\"_blank\" rel=\"noopener noreferrer\">\u00e9pith\u00e9lium<\/a> simple.<br \/>\nLa hauteur des cellules \u00e9tant relativement \u00e9lev\u00e9e, il est de type cubique. La pr\u00e9sence dans la lumi\u00e8re de longs filaments ondul\u00e9s sugg\u00e8re que ses cellules sont <a href=\"\/codex\/glossaire\/glossaire-de-a-a-c#cilie_a\" target=\"_blank\" rel=\"noopener noreferrer\">cili\u00e9es<\/a>.<\/p>\n<p> &nbsp; <\/p>\n<p>La masse centrale est envelopp\u00e9e d&rsquo;une fine couche continue. Elle comporte des renflements correspondant \u00e0 des noyaux plats. Il s&rsquo;agit d&rsquo;un \u00e9pith\u00e9lium simple et pavimenteux localis\u00e9 au contact de l&rsquo;espace semblant vide.<\/p>\n<p>L&rsquo;espace vide est vraisemblablement une cavit\u00e9 liquidienne, dans laquelle des cellules libres sont pr\u00e9sentes sous forme d&rsquo;unit\u00e9s dispers\u00e9es.<\/p>\n<p>De tels vastes espaces liquidiens contenant des cellules isol\u00e9es vari\u00e9es sont rencontr\u00e9s dans le groupe des <a href=\"\/codex\/glossaire\/glossaire-de-a-a-c#annelide\" target=\"_blank\" rel=\"noopener noreferrer\">Ann\u00e9lides<\/a>, et notamment chez le Lombric \u00e9galement appel\u00e9 Ver de terre. Ce sont des cavit\u00e9s <a href=\"\/codex\/glossaire\/glossaire-de-a-a-c#coelomique\" target=\"_blank\" rel=\"noopener noreferrer\">c\u0153lomiques<\/a> remplies de liquide c\u0153lomique contenant de nombreuses cellules, les c\u0153lomocytes.<br \/>\nLes cavit\u00e9s c\u0153lomiques sont d\u00e9crites dans les articles des semaines <a href=\"\/codex\/semaine-41-2018\">41-2018<\/a> et <a href=\"\/codex\/semaine-42-2018\">42-2018<\/a> de Codex virtualis, et les c\u0153lomocytes dans les articles des semaines <a href=\"\/codex\/semaine-37-2018\">37-2018<\/a>, <a href=\"\/codex\/semaine-38-2018\">38-2018<\/a> et <a href=\"\/codex\/semaine-39-2018\">39-2018<\/a>.<\/p>\n<p>Parmi les tubes baignant dans les cavit\u00e9s c\u0153lomiques figurent les tubes n\u00e9phridiens, constituants des organes <a href=\"\/codex\/glossaire\/glossaire-de-d-a-h#excreteur\" target=\"_blank\" rel=\"noopener noreferrer\">excr\u00e9teurs<\/a>, les m\u00e9tan\u00e9phridies.<br \/>\nChaque <a href=\"\/codex\/glossaire\/glossaire-de-i-a-o#metamere\" target=\"_blank\" rel=\"noopener noreferrer\">m\u00e9tam\u00e8re<\/a> corporel du Lombric est organis\u00e9 autour d&rsquo;une cavit\u00e9 c\u0153lomique et comporte une paire de m\u00e9tan\u00e9phridies. Chacune est form\u00e9e d&rsquo;un entonnoir cili\u00e9 appel\u00e9 n\u00e9phrostome, d\u00e9crit dans l&rsquo;article de la semaine <a href=\"\/codex\/semaine-17-2019\">17-2019<\/a>, et d&rsquo;un tube n\u00e9phridien.<\/p>\n<p> &nbsp; <\/p>\n<p>Le n\u00e9phrostome est responsable du transfert du liquide c\u0153lomique contenant les d\u00e9chets m\u00e9taboliques dans la m\u00e9tan\u00e9phridie. Il est \u00e0 l&rsquo;origine de l&rsquo;urine primitive.<\/p>\n<p>Le tube n\u00e9phridien assure la modification de la composition de l&rsquo;urine primitive et la transforme en urine d\u00e9finitive. Il comporte plusieurs segments distincts par leurs dimensions, leurs structures et leurs fonctions.<br \/>\nLe segment gr\u00eale, situ\u00e9 imm\u00e9diatement en aval du n\u00e9phrostome et d\u00e9crit dans l&rsquo;article de la semaine <a href=\"\/codex\/semaine-19-2019\">19-2019<\/a>, est impliqu\u00e9 dans la s\u00e9cr\u00e9tion de d\u00e9chets azot\u00e9s.<\/p>\n<p>Le segment moyen qui lui fait suite, et est l&rsquo;objet de l&rsquo;article de la semaine 20-2019, a une organisation voisine. Il pr\u00e9sente cependant un diam\u00e8tre plus important, de l&rsquo;ordre de 60\u00b5m, et un \u00e9pith\u00e9lium plus \u00e9pais. Il est le si\u00e8ge de r\u00e9absorptions d&rsquo;ions et d&rsquo;eau depuis l&rsquo;urine vers le sang.<\/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>Goodrich E.S., 1932 \u2013 <a target=\"_blank\" href=\"http:\/\/jcs.biologists.org\/content\/joces\/s2-75\/297\/165.full.pdf\" rel=\"noopener noreferrer\">On the nephridiostome of <em>Lumbricus<\/em>.<\/a> Quarterly journal of microscopical science, 75 : 165-179 (adresse : http:\/\/jcs.biologists.org\/content\/joces\/s2-75\/297\/165.full.pdf)<\/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><span style=\"color: #999999;\">&bull; <\/span>Leake L. D., 1975 \u2013 Comparative histology, an introduction to the microscopic structure of animals. Academic press, 738p. London, New York, San Francisco<\/p>\n<p><span style=\"color: #999999;\">&bull; <\/span>Ramsay J.A., 1949 \u2013 <a target=\"_blank\" href=\"http:\/\/jeb.biologists.org\/content\/jexbio\/26\/1\/65.full.pdf\" rel=\"noopener noreferrer\">The site of formation of hypotonic urine in the nephridium of <em>Lumbricus<\/em><\/a>. Journal of experimental biology, 26 : 65-75 (adresse : http:\/\/jeb.biologists.org\/content\/jexbio\/26\/1\/65.full.pdf)<\/p>\n<p> &nbsp; <\/p>\n<hr \/>\n","protected":false},"excerpt":{"rendered":"<p>Une citation \u00ab\u00a0L&rsquo;homme sans patience est une lampe sans huile.\u00a0\u00bb A. de Musset &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 20-2019 provient de l&rsquo;observation d&rsquo;une coupe histologique \u00e0 l&rsquo;objectif x20 du microscope photonique. Elle comporte une masse centrale baignant dans un espace semblant [&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":[47,14,23,22],"class_list":["post-12012","post","type-post","status-publish","format-standard","hentry","category-a-la-une","tag-annelide","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=\"Coupe transversale de segment moyen de tube n\u00e9phridien de m\u00e9tan\u00e9phridie de Lombric (\u00e9pith\u00e9lium simple cubique et cili\u00e9)\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"S. 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