![\"Quel](\"\/documents\/images\/histologie_articles\/branchie\/roussette_branchie_145_33-WEB.jpg\")
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Voir l’image de plus grande taille<\/a><\/p>\n <\/p>\n Voir l’image l\u00e9gend\u00e9e<\/a><\/p>\n <\/p>\n L’image de la semaine 35-2019 r\u00e9sulte de l’observation d’une coupe histologique \u00e0 l’objectif x40 du microscope photonique.<\/p>\n Elle comporte une masse circulaire et un espace semblant vide, entour\u00e9s de mat\u00e9riel fibreux. <\/p>\n <\/p>\n La masse circulaire est form\u00e9e d’unit\u00e9s concentriques, allong\u00e9es et courb\u00e9es. Elle contiennent chacune une sous-unit\u00e9 nettement d\u00e9limit\u00e9e et finement granuleuse, baignant dans un milieu homog\u00e8ne. Leur forme allong\u00e9e, leur cytoplasme lisse et la pr\u00e9sence d’une fine couche fibreuse les isolant les unes des autres, sugg\u00e8rent qu’il s’agit de fibres musculaires lisses. Elles sont de mani\u00e8re g\u00e9n\u00e9rale dispos\u00e9es de mani\u00e8re circulaire.<\/p>\n <\/p>\n L’espace semblant vide est d\u00e9limit\u00e9 par une paroi \u00e9galement form\u00e9e de cellules, agenc\u00e9es en tuniques superpos\u00e9es.<\/p>\n Au contact de la lumi\u00e8re, une couche continue de cellules est pr\u00e9sente, le plus souvent aussi hautes que larges, parfois aplaties. Elles constituent un tissu \u00e9pith\u00e9lial<\/a> de rev\u00eatement, simple et cubique. <\/p>\n Il est entour\u00e9 d’une tunique plus \u00e9paisse, comprenant un mat\u00e9riel fibreux dans lequel sont ench\u00e2ss\u00e9es des cellules. Certaines sont de petite taille, fusiformes et dispers\u00e9es, alors que d’autres sont plus volumineuses, circulaires et group\u00e9es. Autour, seul le tissu conjonctif fibreux est pr\u00e9sent.<\/p>\n Cet agencement est caract\u00e9ristique des vaisseaux sanguins des Vert\u00e9br\u00e9s : la lumi\u00e8re est bord\u00e9e d’un \u00e9pith\u00e9lium simple soutenu par une fine couche de tissu conjonctif, formant une intima<\/a>, autour de laquelle des fibres musculaires lisses associ\u00e9es \u00e0 du tissu conjonctif constituent une m\u00e9dia, entour\u00e9e d’une adventice<\/a> conjonctive. <\/p>\n L’image de la semaine 35-2019 repr\u00e9sente la structure d’un septum de branchie<\/a> de Roussette, Vert\u00e9br\u00e9 \u00e9lasmobranche, d\u00e9crit dans l’article de la semaine 29-2019<\/a> de Codex virtualis et localis\u00e9 dans celui de la semaine 28-2019<\/a>.<\/p>\n En l’occurrence, l’espace semblant vide correspond \u00e0 un corps caverneux situ\u00e9 \u00e0 la base d’une lame branchiale et illustr\u00e9 dans l’article de la semaine 33-2019<\/a> et la masse circulaire \u00e0 un sphincter contr\u00f4lant le flux sanguin alimentant le corps caverneux depuis l’art\u00e8re<\/a> branchiale<\/a> aff\u00e9rente<\/a>.<\/p>\n <\/p>\n Pour en savoir plus, consulter :<\/p>\n • <\/span>les pages Premiers pas histologiques<\/a> de Codex virtualis (adresse : http:\/\/codexvirtualis.fr\/codex\/de-lorganisation-interne\/premiers-pas-histologiques)<\/p>\n • <\/span>Burkitt H.G., Young B., Heath J.W., 1993 \u2013 Histologie fonctionnelle Wheater. Arnette, 408p. Paris<\/p>\n • <\/span>Genten F., Terwinghe E., Danguy A., 2010 – Histologie illustr\u00e9e du poisson. Qu\u00e6, collection Savoir-faire, 505p. Versailles<\/p>\n • <\/span>Heusser S., Dupuy H.G., 2015 \u2013 Atlas biologie animale. Dunod, 220p. Paris<\/p>\n • <\/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 • <\/span>Wright D.E., 1973 – 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) <\/p>\n Une citation \u00ab\u00a0Le pass\u00e9 et le futur rentrent continuellement l\u2019un dans l\u2019autre et ne donnent jamais que le pr\u00e9sent.\u00a0\u00bb L. M. Deschamps Une image Voir l’image de plus grande taille Voir l’image l\u00e9gend\u00e9e L’image de la semaine 35-2019 r\u00e9sulte de l’observation d’une coupe histologique \u00e0 l’objectif x40 du microscope photonique. Elle […]<\/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":""},"categories":[1],"tags":[55,14,23,22],"class_list":["post-12219","post","type-post","status-publish","format-standard","hentry","category-a-la-une","tag-elasmobranche","tag-histologie","tag-observation","tag-physiologie"],"aioseo_notices":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/posts\/12219","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/comments?post=12219"}],"version-history":[{"count":10,"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/posts\/12219\/revisions"}],"predecessor-version":[{"id":12815,"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/posts\/12219\/revisions\/12815"}],"wp:attachment":[{"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/media?parent=12219"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/categories?post=12219"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/tags?post=12219"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\nUne telle organisation est caract\u00e9ristique des <\/a>cellules<\/a> animales, la sous-unit\u00e9 ponctu\u00e9e correspondant \u00e0 un noyau et le milieu l’entourant \u00e0 du cytoplasme<\/a>.<\/p>\n
\nLe mat\u00e9riel fibreux associ\u00e9 aux petites cellules effil\u00e9es correspond \u00e0 du tissu conjonctif<\/a> fibreux, les fibres \u00e9tant des faisceaux de fibres de collag\u00e8ne<\/a> extracellulaires<\/a> et les cellules des fibrocytes<\/a>.
\nLes cellules circulaires group\u00e9es sont des fibres musculaires lisses en section transversale.<\/p>\n
\nToutefois, l’\u00e9pith\u00e9lium<\/a> bordant la lumi\u00e8re des vaisseaux sanguins, appel\u00e9 endoth\u00e9lium<\/a>, est le plus souvent pavimenteux.<\/p>\n
\nDOI = 10.1007\/BF00307376<\/a><\/p>\n
\n","protected":false},"excerpt":{"rendered":"