{"id":12101,"date":"2019-06-17T08:00:39","date_gmt":"2019-06-17T06:00:39","guid":{"rendered":"https:\/\/codexvirtualis.fr\/codex\/?p=12101"},"modified":"2019-08-25T18:42:29","modified_gmt":"2019-08-25T16:42:29","slug":"semaine-25-2019","status":"publish","type":"post","link":"https:\/\/codexvirtualis.fr\/codex\/semaine-25-2019","title":{"rendered":"Semaine 25-2019"},"content":{"rendered":"<h2>Une citation<\/h2>\n<p>\u00ab\u00a0N&rsquo;ayez d&rsquo;intol\u00e9rance que vis-\u00e0-vis de l&rsquo;intol\u00e9rance.\u00a0\u00bb<\/p>\n<p>H. Taine<\/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\/branchie\/roussette_branchie_145_35-WEB.jpg\"><img decoding=\"async\" src=\"\/documents\/images\/histologie_articles\/branchie\/roussette_branchie_145_35-WEB.jpg\" 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\/elasmobranche-adulte\/branchie\/roussette_branchie_145_35_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\/branchie\/roussette_branchie_145_35_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 25-2019 r\u00e9sulte de l&rsquo;observation d&rsquo;une coupe histologique \u00e0 l&rsquo;objectif x100 du microscope photonique.<\/p>\n<p>Elle comporte une s\u00e9rie de structures composites, plates et longues, dont l&rsquo;extr\u00e9mit\u00e9 libre est arrondie. Il s&rsquo;agit vraisemblablement de lames ou de filaments coup\u00e9s longitudinalement.<\/p>\n<p> &nbsp; <\/p>\n<p>Les unit\u00e9s constituant les structures composites contiennent de mani\u00e8re g\u00e9n\u00e9rale une sous-unit\u00e9 ovale ou circulaire, nettement d\u00e9limit\u00e9e et finement ponctu\u00e9e. Elle est entour\u00e9e d&rsquo;une masse granuleuse d&rsquo;abondance variable, circonscrite par une bordure peu visible.<\/p>\n<p>Une telle organisation est caract\u00e9ristique des <\/a><a href=\"\/codex\/glossaire\/glossaire-de-a-a-c#cellule\" target=\"_blank\" rel=\"noopener noreferrer\">cellules<\/a> animales, la sous-unit\u00e9 ponctu\u00e9e correspondant au noyau, la masse l&rsquo;entourant au <a href=\"\/codex\/glossaire\/glossaire-de-a-a-c#cytoplasme\" target=\"_blank\" rel=\"noopener noreferrer\">cytoplasme<\/a> et la bordure externe mat\u00e9rialisant la membrane plasmique.<\/p>\n<p> &nbsp; <\/p>\n<p>Les cellules bordant les structures composites sont agenc\u00e9es en une unique couche continue et plate. Jointives, elles pr\u00e9sentent en outre un noyau plat.<\/p>\n<p>Elles forment un <a href=\"\/codex\/glossaire\/glossaire-de-t-a-z#tissu-epithelial\" target=\"_blank\" rel=\"noopener noreferrer\">tissu \u00e9pith\u00e9lial<\/a> de rev\u00eatement simple et pavimenteux, reposant sur du <a href=\"\/codex\/glossaire\/glossaire-de-t-a-z#tissu-conjonctif\" target=\"_blank\" rel=\"noopener noreferrer\">tissu conjonctif<\/a> fibreux. <\/p>\n<p>L&rsquo;\u00e9pith\u00e9lium appara\u00eet repli\u00e9 sur lui-m\u00eame, formant deux feuillets parall\u00e8les. L&rsquo;espace entre les deux feuillets comprend des cellules isol\u00e9es, biconcaves, dont les extr\u00e9mit\u00e9s sont au contact de leurs faces internes. Semblant soutenir l&rsquo;\u00e9pith\u00e9lium, elles portent le nom de cellules piliers ou en pilastre.<\/p>\n<p>Les cellules piliers et l&rsquo;\u00e9pith\u00e9lium d\u00e9limitent des lacunes poss\u00e9dant une fine paroi et contenant des cellules elliptiques \u00e0 cytoplasme homog\u00e8ne et noyau dense allong\u00e9. Il s&rsquo;agit de cellules sanguines isol\u00e9es, en l&rsquo;occurrence de globules rouges \u00e9galement appel\u00e9s <a href=\"\/codex\/glossaire\/glossaire-de-d-a-h#erythrocyte\" target=\"_blank\" rel=\"noopener noreferrer\">\u00e9rythrocytes<\/a>. Ils circulent dans des vaisseaux sanguins <a href=\"\/codex\/glossaire\/glossaire-de-a-a-c#capillaire\" target=\"_blank\" rel=\"noopener noreferrer\">capillaires<\/a>, de faible diam\u00e8tre et d\u00e9limit\u00e9s par un \u00e9pith\u00e9lium simple et pavimenteux dit <a href=\"\/codex\/glossaire\/glossaire-de-d-a-h#endothelium\" target=\"_blank\" rel=\"noopener noreferrer\">endoth\u00e9lium<\/a>.<\/p>\n<p> &nbsp; <\/p>\n<p>Les structures ainsi d\u00e9crites, leur r\u00e9p\u00e9tition et leur organisation sugg\u00e8rent que l&rsquo;organe ayant servi \u00e0 confectionner la coupe est le site d&rsquo;\u00e9changes entre l&rsquo;organisme et son environnement. <\/p>\n<p>L&rsquo;\u00e9pith\u00e9lium les recouvrant est fin et situ\u00e9 \u00e0 faible distance du compartiment sanguin repr\u00e9sent\u00e9 par les vaisseaux capillaires. L&rsquo;\u00e9changeur est ainsi constitu\u00e9 des deux \u00e9pith\u00e9liums simples et pavimenteux de la lame et du vaisseau, s\u00e9par\u00e9s par une \u00e9troite couche de tissu conjonctif fibreux. L&rsquo;\u00e9paisseur \u00e0 franchir par les substances \u00e9chang\u00e9es, du milieu ext\u00e9rieur au milieu int\u00e9rieur et inversement, est en cons\u00e9quence r\u00e9duite.<\/p>\n<p>Les replis de l&rsquo;\u00e9pith\u00e9lium \u00e0 l&rsquo;origine de la s\u00e9rie de structures plates et allong\u00e9es contribuent \u00e0 augmenter la surface de contact entre le milieu ext\u00e9rieur et le milieu int\u00e9rieur.<\/p>\n<p>Cette disposition est rencontr\u00e9e en particulier dans les <a href=\"\/codex\/glossaire\/glossaire-de-a-a-c#appareil\" target=\"_blank\" rel=\"noopener noreferrer\">appareils<\/a> respiratoires des animaux, sites des \u00e9changes des gaz respiratoires.<br \/>\nIls sont r\u00e9alis\u00e9s par un processus de <a href=\"\/codex\/glossaire\/glossaire-de-d-a-h#diffusion\" target=\"_blank\" rel=\"noopener noreferrer\">diffusion<\/a>, c&rsquo;est-\u00e0-dire de passage d&rsquo;un compartiment \u00e0 l&rsquo;autre selon le gradient de pression partielle ou de concentration. En l&rsquo;occurrence, les \u00e9changeurs de gaz respiratoires permettent la p\u00e9n\u00e9tration dans l&rsquo;organisme, depuis le milieu de vie, de dioxyg\u00e8ne et inversement la lib\u00e9ration, depuis l&rsquo;organisme jusqu&rsquo;au milieu, de dioxyde de carbone.<\/p>\n<p>De tels \u00e9changes sont favoris\u00e9s par la faible \u00e9paisseur et la grande surface de l&rsquo;\u00e9changeur.<br \/>\nIls le sont \u00e9galement du fait de la circulation sanguine sous la surface d&rsquo;\u00e9changes, assurant l&rsquo;apport r\u00e9gulier de dioxyde de carbone et la prise en charge rapide du dioxyg\u00e8ne, contribuant ainsi au maintien des gradients de pressions partielles des deux gaz au niveau de l&rsquo;\u00e9changeur.<br \/>\nDe la m\u00eame mani\u00e8re, le renouvellement du milieu au contact de l&rsquo;\u00e9changeur, \u00e9vacuant le dioxyde de carbone et apportant du dioxyg\u00e8ne, soutiennent les gradients.<\/p>\n<p> &nbsp; <\/p>\n<p>La forme de l&rsquo;\u00e9changeur, en lamelles, est caract\u00e9ristique des <a href=\"\/codex\/glossaire\/glossaire-de-a-a-c#branchie\" target=\"_blank\" rel=\"noopener noreferrer\">branchies<\/a> des animaux aquatiques.<br \/>\nIl s&rsquo;agit en l&rsquo;occurrence de lamelles branchiales d&rsquo;un \u00c9lasmobranche, la Roussette.<\/p>\n<p>Le dioxyg\u00e8ne diffuse \u00e0 travers l&rsquo;\u00e9pith\u00e9lium vers les vaisseaux capillaires o\u00f9 il est pris en charge par les \u00e9rythrocytes sanguins qui le distribuent \u00e0 toutes les cellules de l&rsquo;organisme.<br \/>\n\u00c0 l&rsquo;inverse, le dioxyde de carbone produit par les cellules de l&rsquo;organisme est drain\u00e9 et achemin\u00e9 par le sang vers les lamelles branchiales, d&rsquo;o\u00f9 il diffuse vers le milieu ext\u00e9rieur.<\/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>Genten F., Terwinghe E., Danguy A., 2010 &#8211; Histologie illustr\u00e9e du poisson. Qu\u00e6, collection Savoir-faire, 505p. Versailles<\/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>Wright D.E., 1973 &#8211; <a href=\"https:\/\/link.springer.com\/article\/10.1007\/BF00307376\" target=\"_blank\" rel=\"noopener noreferrer\">The Structure of the gills of the Elasmobranch, Scyliorhinus canicula (L.).<\/a> Zeitschrift f\u00fcr Zellforschung und Mikroskopische Anatomie, 144, 4 : 489-509 (adresse : https:\/\/link.springer.com\/article\/10.1007\/BF00307376)<br \/>\n<a href=\"http:\/\/dx.doi.org\/10.1007\/BF00307376 \" target=blank\" rel=\"noopener noreferrer\">DOI = 10.1007\/BF00307376<\/a><\/p>\n<p> &nbsp; <\/p>\n<hr \/>\n","protected":false},"excerpt":{"rendered":"<p>Une citation \u00ab\u00a0N&rsquo;ayez d&rsquo;intol\u00e9rance que vis-\u00e0-vis de l&rsquo;intol\u00e9rance.\u00a0\u00bb H. Taine &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 25-2019 r\u00e9sulte de l&rsquo;observation d&rsquo;une coupe histologique \u00e0 l&rsquo;objectif x100 du microscope photonique. Elle comporte une s\u00e9rie de structures composites, plates et longues, dont l&rsquo;extr\u00e9mit\u00e9 libre [&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":[55,14,23,22],"class_list":["post-12101","post","type-post","status-publish","format-standard","hentry","category-a-la-une","tag-elasmobranche","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=\"Lamelles branchiales de branchie de Roussette en coupe longitudinale, avec \u00e9pith\u00e9lium simple pavimenteux, cellules piliers et vaisseaux sanguins capillaires\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"S. 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