![\"Quel](\"\/documents\/images\/histologie_articles\/branchie\/roussette_branchie_145_54-WEB.jpg\")
<\/p>\n
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 30-2019 provient de l’observation d’une coupe histologique \u00e0 l’objectif x40 du microscope photonique.<\/p>\n Elle appara\u00eet constitu\u00e9e de deux unit\u00e9s distinctes par leurs organisations.<\/p>\n <\/p>\n L’unit\u00e9 sup\u00e9rieure est form\u00e9e de structures accol\u00e9es, agenc\u00e9es en couches superpos\u00e9es. La plupart sont de dimension relativement r\u00e9duite, et contiennent une sous-unit\u00e9 circulaire ou ovale finement ponctu\u00e9e entour\u00e9e d’un espace peu color\u00e9 et relativement homog\u00e8ne. Quelques-unes sont volumineuses et ovales, contiennent principalement une masse semblant vacuolis\u00e9e bord\u00e9e d’une fine couronne dans laquelle une sous-unit\u00e9 dense et plate est pr\u00e9sente. Accol\u00e9es les unes aux autres, les cellules constituent un tissu \u00e9pith\u00e9lial<\/a> de rev\u00eatement. Comprenant plusieurs couches, il est qualifi\u00e9 de pluristratifi\u00e9. Les cellules de la couche superficielle sont plates, allong\u00e9es dans le plan de l’\u00e9pith\u00e9lium de m\u00eame que leurs noyaux. En cons\u00e9quence il est dit pavimenteux. Les cellules de la couche basale sont plus hautes que larges et leurs noyaux sont allong\u00e9s perpendiculairement au plan de l’\u00e9pith\u00e9lium. Elles constituent une assise<\/a> germinative<\/a>. Elles s’y divisent et assurent ainsi le renouvellement des cellules superficielles. <\/p>\n L’\u00e9pith\u00e9lium pluristratifi\u00e9 pavimenteux surmonte un tissu fibreux dense dans lequel des cellules ainsi que d’\u00e9troites lacunes sont dispers\u00e9es. <\/p>\n L’image de la semaine 30-2019 illustre le rev\u00eatement du septum de branchie de Roussette d\u00e9crit dans l’article de la semaine 29-2019<\/a> de Codex virtualis. <\/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\u00a0La cr\u00e9ativit\u00e9, c’est l’intelligence qui s’amuse.\u00a0\u00bb A. Einstein Une image Voir l’image de plus grande taille Voir l’image l\u00e9gend\u00e9e L’image de la semaine 30-2019 provient de l’observation d’une coupe histologique \u00e0 l’objectif x40 du microscope photonique. Elle appara\u00eet constitu\u00e9e de deux unit\u00e9s distinctes par leurs organisations. L’unit\u00e9 sup\u00e9rieure […]<\/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-12208","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\/12208","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=12208"}],"version-history":[{"count":14,"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/posts\/12208\/revisions"}],"predecessor-version":[{"id":12290,"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/posts\/12208\/revisions\/12290"}],"wp:attachment":[{"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/media?parent=12208"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/categories?post=12208"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/tags?post=12208"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\nLes structures ainsi d\u00e9crites correspondent \u00e0 des <\/a>cellules<\/a> animales, les sous-unit\u00e9s qu’elles contiennent sont des noyaux et l’espace les entourant est du cytoplasme<\/a>. <\/p>\n
\nLes cellules volumineuses ont une fonction s\u00e9cr\u00e9trice : les produits qu’elles synth\u00e9tisent sont stock\u00e9s dans des v\u00e9sicules group\u00e9es, ayant l’apparence de poches vacuolis\u00e9es. Produisant du mucus qu’elles lib\u00e8rent \u00e0 la surface de l’\u00e9pith\u00e9lium, elles sont appel\u00e9es mucocytes<\/a>.<\/p>\n
\nUn tel agencement est caract\u00e9ristique du tissu conjonctif<\/a> fibreux. Les cellules correspondent \u00e0 des fibrocytes<\/a> s\u00e9par\u00e9s par du mat\u00e9riel extracellulaire abondant, comportant des fibres de collag\u00e8ne<\/a> group\u00e9es en faisceaux. Il est parcouru de vaisseaux sanguins capillaires<\/a> se pr\u00e9sentant comme d’\u00e9troites lumi\u00e8res bord\u00e9es d’une fine paroi.<\/p>\n
\nIl est form\u00e9 d’un \u00e9pith\u00e9lium pluristratifi\u00e9 pavimenteux contenant des cellules muqueuses, surmontant un tissu conjonctif fibreux dense. Cette organisation est semblable \u00e0 celle du t\u00e9gument<\/a> avec lequel il est en continuit\u00e9, exception faite des \u00e9cailles<\/a>.<\/p>\n
\nDOI = 10.1007\/BF00307376<\/a><\/p>\n
\n","protected":false},"excerpt":{"rendered":"