![\"Quel](\"\/documents\/images\/histologie_articles\/compartiments_liquidiens\/lombric_vaisseau_dorsal_02-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 47-2018 provient de l’observation d’une coupe histologique \u00e0 l’objectif x40 du microscope photonique.<\/p>\n Elle appara\u00eet constitu\u00e9e d’une portion de structure creuse et ovale dont la paroi est composite. Elle d\u00e9limite un espace central occup\u00e9 par des unit\u00e9s isol\u00e9es de forme ovale \u00e0 circulaire. Il s’agit vraisemblablement d’une partie de section transversale d’organe tubuleux.<\/p>\n <\/p>\n Les unit\u00e9s ovales ou circulaires pr\u00e9sentes dans la lumi\u00e8re du tube contiennent une structure sombre et ovale, entour\u00e9e d’une masse claire et granuleuse. Ce sont des <\/a>cellules<\/a>, la structure sombre correspondant \u00e0 un noyau et la masse claire au cytoplasme<\/a>. <\/p>\n La paroi du tube comporte, de la lumi\u00e8re vers la p\u00e9riph\u00e9rie :<\/p>\n • <\/span>une tunique discontinue de cellules de dimensions r\u00e9duites, poss\u00e9dant peu de cytoplasme ;<\/p>\n • <\/span>une couche ondul\u00e9e, continue et dense, de nature fibreuse ;<\/p>\n • <\/span>un espace \u00e9troit occup\u00e9 par des fibres l\u00e2ches et quelques cellules dispers\u00e9es ;<\/p>\n • <\/span>une tunique form\u00e9e de cellules de grande taille, allong\u00e9es et \u00e0 disposition concentrique, pr\u00e9sentant un cytoplasme homog\u00e8ne :<\/p>\n • <\/span>une assise continue de cellules cubiques.<\/p>\n Ces structures constituent respectivement un r\u00e9seau cellulaire bordant la lumi\u00e8re, deux couches de tissu conjonctif<\/a> fibreux dense puis l\u00e2che, une tunique de fibres musculaires lisses principalement circulaires et un \u00e9pith\u00e9lium<\/a> simple cubique.<\/p>\n L’ensemble est entour\u00e9 de volumineuses cellules \u00e0 cytoplasme granuleux et \u00e0 noyau excentr\u00e9.<\/p>\n <\/p>\n Une telle organisation est rencontr\u00e9e dans les vaisseaux sanguins des Ann\u00e9lides<\/a>. En l’occurrence, l’image repr\u00e9sente une coupe transversale de vaisseau sanguin de Lombric, \u00e9galement appel\u00e9 Ver de terre, dont une vue compl\u00e8te est pr\u00e9sent\u00e9e dans l’article de la semaine 46-2018<\/a> de Codex virtualis. Il est entour\u00e9 de chloragocytes<\/a>. <\/p>\n <\/p>\n Le Lombric, et plus g\u00e9n\u00e9ralement de nombreuses Ann\u00e9lides, poss\u00e8dent plusieurs compartiments liquidiens en particulier le compartiment sanguin repr\u00e9sent\u00e9 par un ensemble continu de vaisseaux et le compartiment c\u0153lomique<\/a> correspondant aux cavit\u00e9s c\u0153lomiques et formant le c\u0153lome<\/a>. Leur agencement est d\u00e9crit dans les articles des semaines 41-2018<\/a> et 42-2018<\/a>, leur paroi dans les articles des semaines 43-2018<\/a>, 44-2018<\/a> et 45-2018<\/a>, et les cellules qu’elles contiennent dans les articles des semaines 37-2018<\/a>, 38-2018<\/a>, 39-2018<\/a> et 40-2018<\/a>.<\/p>\n Le compartiment sanguin contient un liquide, le sang, dans lequel des cellules isol\u00e9es sont pr\u00e9sentes, les h\u00e9mocytes. Sch\u00e9matiquement, il circule de l’arri\u00e8re vers l’avant dans le vaisseau sanguin dorsal, dans les deux sens dans le vaisseau sanguin ventral, le plus souvent du ventre vers le dos dans les vaisseaux sanguins lat\u00e9raux.<\/p>\n Le compartiment sanguin assure la prise en charge et la distribution des gaz respiratoires et des substances nutritives. Il draine \u00e9galement les d\u00e9chets du m\u00e9tabolisme qui son ensuite transf\u00e9r\u00e9s dans le compartiment c\u0153lomique. Ainsi, Les compartiments sanguin et c\u0153lomique ont des fonctions compl\u00e9mentaires, et ne sont pas totalement ind\u00e9pendants l’un de l’autre. <\/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>Hanson J., 1949 – The histology of the blood system in Ologochaeta and Polychaeta.<\/a> Biological reviews of Cambridge philosophical society, 24, 2 : 127-173 (adresse : https:\/\/onlinelibrary.wiley.com\/doi\/abs\/10.1111\/j.1469-185X.1949.tb00573.x) • <\/span>Hartenstein V., Mandal L., 2006 – The blood\/vascular system in a phylogenetic perspective.<\/a> BioEssays, 28, 12 : 1203-1210 (adresse : https:\/\/onlinelibrary.wiley.com\/doi\/abs\/10.1002\/bies.20497) • <\/span>Heusser S., Dupuy H.G., 2015 \u2013 Atlas biologie animale. Dunod, 220p. Paris<\/p>\n • <\/span>Johnston J.B., 1903 – On the blood vessels, their valves and the course of the blood in Lumbricus.<\/a> Biological Bulletin, 5, 2 : 74-84 (adresse : https:\/\/www.jstor.org\/stable\/1535513)<\/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>Mu\u00f1oz\u2010Ch\u00e1puli R., Carmona R., Guadix J.A., Mac\u00edas D., P\u00e9rez\u2010Pomares J.M., 2005 – The origin of the endothelial cells: an evo\u2010devo approach for the invertebrate\/vertebrate transition of the circulatory system.<\/a> Evolution & Development, 7, 4 : 351-358 (adresse : https:\/\/onlinelibrary.wiley.com\/doi\/abs\/10.1111\/j.1525-142X.2005.05040.x) <\/p>\n Une citation \u00ab\u00a0Si aujourd’hui, ici-bas, une foule d’individus d\u00e9sirait le bonheur plut\u00f4t que le malheur des autres, il suffirait de quelques ann\u00e9es pour que la terre soit un paradis.\u00a0\u00bb B. Russell Une image Voir l’image de plus grande taille Voir l’image l\u00e9gend\u00e9e L’image de la semaine 47-2018 provient de l’observation d’une […]<\/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-11534","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\/11534","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=11534"}],"version-history":[{"count":18,"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/posts\/11534\/revisions"}],"predecessor-version":[{"id":11567,"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/posts\/11534\/revisions\/11567"}],"wp:attachment":[{"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/media?parent=11534"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/categories?post=11534"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/tags?post=11534"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\nCe dernier est impliqu\u00e9 dans le stockage et le transfert de substances de r\u00e9serve, la d\u00e9fense de l’organisme et la gam\u00e9togen\u00e8se. Il joue aussi le r\u00f4le d’hydrosquelette.<\/p>\n
\nDOI : 10.1111\/j.1469-185X.1949.tb00573.x<\/a><\/p>\n
\nDOI : 10.1002\/bies.20497<\/a><\/p>\n
\nDOI : 10.1111\/j.1525-142X.2005.05040.x<\/a><\/p>\n
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