![\"Quel](\"\/documents\/images\/histologie_articles\/compartiments_liquidiens\/lombric_dissepiment_02-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 44-2018 provient de l’observation d’une coupe histologique \u00e0 l’objectif x20 du microscope photonique.<\/p>\n Elle comporte dans sa r\u00e9gion inf\u00e9rieure une structure fibreuse \u00e9mettant un prolongement oblique vers l’angle sup\u00e9rieur droit. De part et d’autre, deux espaces semblant vides sont visibles.<\/p>\n <\/p>\n La structure fibreuse inf\u00e9rieure, de m\u00eame que sa projection oblique, est principalement form\u00e9e d’unit\u00e9s allong\u00e9es et homog\u00e8nes, contenant parfois une masse ovale l\u00e9g\u00e8rement plus sombre. Des unit\u00e9s d’organisation similaire mais de forme circulaire ou l\u00e9g\u00e8rement anguleuse sont \u00e9galement pr\u00e9sentes. <\/p>\n L’image appara\u00eet ainsi constitu\u00e9e de deux cavit\u00e9s isol\u00e9es par une cloison de nature musculaire. Au contact des cavit\u00e9s, la musculature est recouverte d’une fine tunique fibreuse surmont\u00e9e d’un \u00e9troit liser\u00e9 continu portant localement de l\u00e9gers renflements. Dans la tunique de tissu conjonctif sont ench\u00e2ss\u00e9es de volumineuses structures circulaires dont le contenu est, selon les cas, homog\u00e8ne ou h\u00e9t\u00e9rog\u00e8ne. <\/p>\n Les cavit\u00e9s isol\u00e9es par la cloison contiennent des unit\u00e9s isol\u00e9es, de dimensions relativement r\u00e9duites mais de formes diverses. Il s’agit de cellules<\/a> libres sugg\u00e9rant que les cavit\u00e9s contiennent un liquide corporel.<\/p>\n <\/p>\n Une telle organisation est caract\u00e9ristique du corps des Ann\u00e9lides, en l’occurrence du Lombric, d\u00e9crite dans l’article de la semaine 41-2018<\/a> de Codex virtualis. Un \u00e9pith\u00e9lium simple pavimenteux reposant sur du tissu conjonctif fibreux d\u00e9limite les cavit\u00e9s c\u0153lomiques. Sa r\u00e9gion situ\u00e9e au contact de la paroi corporelle porte le nom de somatopleure, elle est montr\u00e9e dans l’article de la semaine 43-2018<\/a>. L’image de la semaine 44-2018 repr\u00e9sente ainsi une partie de coupe longitudinale de Lombric, correspondant \u00e0 la r\u00e9gion ventrale. Le diss\u00e9piment la traversant appara\u00eet form\u00e9 de fibres musculaires circulaires, radiales et obliques, ce qui explique les diverses sections de fibres observ\u00e9es.<\/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>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>Newell G.E., 1950 – The role of the coelomic fluid in the movements of earthworms.<\/a> Journal of Experimental Biology, 27 : 110-122 (adresse : http:\/\/jeb.biologists.org\/content\/27\/1\/110) <\/p>\n Une citation \u00ab\u00a0On est intelligent aussi avec la t\u00eate des autres.\u00a0\u00bb H. Caillavet Une image Voir l’image de plus grande taille Voir l’image l\u00e9gend\u00e9e L’image de la semaine 44-2018 provient de l’observation d’une coupe histologique \u00e0 l’objectif x20 du microscope photonique. Elle comporte dans sa r\u00e9gion inf\u00e9rieure une structure fibreuse \u00e9mettant […]<\/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":[47,14,23,22],"class_list":["post-11425","post","type-post","status-publish","format-standard","hentry","category-a-la-une","tag-annelide","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\/11425","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=11425"}],"version-history":[{"count":20,"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/posts\/11425\/revisions"}],"predecessor-version":[{"id":11517,"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/posts\/11425\/revisions\/11517"}],"wp:attachment":[{"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/media?parent=11425"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/categories?post=11425"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/tags?post=11425"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\nIl s’agit de sections de fibres ou cellules musculaires lisses, respectivement longitudinales, transversales voire obliques. Les masses ovales qu’elles contiennent correspondent \u00e0 des noyaux. <\/p>\n
\nIl s’agit d’une tunique de <\/a>tissu conjonctif<\/a> fibreux bord\u00e9e d’un \u00e9pith\u00e9lium<\/a> de rev\u00eatement simple et pavimenteux.<\/p>\n
\nElles correspondent \u00e0 des coupes transversales de vaisseaux sanguins pour les premi\u00e8res et de nerfs pour les secondes.<\/p>\n
\nIl est constitu\u00e9 de segments successifs appel\u00e9s m\u00e9tam\u00e8res<\/a>, contenant chacun une cavit\u00e9 liquidienne dite cavit\u00e9 c\u0153lomique<\/a>.
\nLe liquide dont les cavit\u00e9s c\u0153lomiques sont remplies contient des cellules libres, les c\u0153lomocytes. Les articles des semaines 37-2018<\/a>, 38-2018<\/a>, 39-2018<\/a> et 40-2018<\/a> les illustrent.<\/p>\n
\nIl tapisse \u00e9galement les diss\u00e9piments<\/a>, cloisons musculeuses isolant les m\u00e9tam\u00e8res et dont la musculature est une extension des muscles pari\u00e9taux circulaires d\u00e9crits dans l’article de la semaine 42-2018<\/a>.<\/p>\n
\nArticle au format pdf<\/a><\/p>\n
\n","protected":false},"excerpt":{"rendered":"