{"id":11757,"date":"2019-01-28T08:00:28","date_gmt":"2019-01-28T07:00:28","guid":{"rendered":"https:\/\/codexvirtualis.fr\/codex\/?p=11757"},"modified":"2019-01-27T15:30:37","modified_gmt":"2019-01-27T14:30:37","slug":"semaine-05-2019","status":"publish","type":"post","link":"https:\/\/codexvirtualis.fr\/codex\/semaine-05-2019","title":{"rendered":"Semaine 05-2019"},"content":{"rendered":"<h2>Une citation<\/h2>\n<p>\u00ab\u00a0Il ne faut pas juger ce qui est possible et ce qui ne l&rsquo;est pas selon ce qui est croyable et incroyable \u00e0 notre sens.\u00a0\u00bb<\/p>\n<p>Montaigne<\/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\/testicule\/lombric_ct_genital_male_calc_oesophage_vesicule_seminale_01-WEB.jpg\"><img decoding=\"async\" src=\"\/documents\/images\/histologie_articles\/testicule\/lombric_ct_genital_male_calc_oesophage_vesicule_seminale_01-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\" href=\"\/images\/albums\/delices-histologiques\/annelide-adulte\/appareil-reproducteur\/lombric_ct_genital_male_calc_oesophage_vesicule_seminale_01_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\" href=\"\/documents\/images\/histologie_articles\/testicule\/lombric_ct_genital_male_calc_oesophage_vesicule_seminale_01_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 05-2019 r\u00e9sulte de l&rsquo;observation d&rsquo;une coupe histologique \u00e0 l&rsquo;objectif x40 du microscope photonique.<\/p>\n<p>Elle est constitu\u00e9e d&rsquo;unit\u00e9s composites juxtapos\u00e9es, g\u00e9n\u00e9ralement de forme ovo\u00efde.<br \/>\nChacune comporte une masse centrale finement granuleuse, entour\u00e9e de structures h\u00e9t\u00e9rog\u00e8nes contenant une sous-unit\u00e9 ovale, ponctu\u00e9e ou filamenteuse.<br \/>\nLes structures pr\u00e9sentes dans une unit\u00e9 sont semblables les unes aux autres et diff\u00e8rent de celles des autres unit\u00e9s.<\/p>\n<p> &nbsp; <\/p>\n<p>Les structures h\u00e9t\u00e9rog\u00e8nes correspondent \u00e0 des <\/a><a href=\"\/codex\/glossaire\/glossaire-de-a-a-c#cellule\" target=\"_blank\">cellules<\/a> animales, la sous-unit\u00e9 ovale qu&rsquo;elles contiennent est leur noyau.<\/p>\n<p>Elles sont group\u00e9es en amas autour de masses centrales, formant des unit\u00e9s distinctes par leur forme et l&rsquo;organisation de leur noyau. <\/p>\n<p> &nbsp; <\/p>\n<p>Ainsi, il existe des groupes dans lesquels les cellules sont :<\/p>\n<p><span style=\"color: #999999;\">&bull; <\/span>de grande taille et poss\u00e8dent un noyau volumineux, contenant des granules gros et denses, et peu de cytoplasme&nbsp;;<\/p>\n<p><span style=\"color: #999999;\">&bull; <\/span>volumineuses et ne pr\u00e9sentent pas de noyau bien d\u00e9limit\u00e9, mais des filaments entrem\u00eal\u00e9s&nbsp;;<\/p>\n<p><span style=\"color: #999999;\">&bull; <\/span>de taille r\u00e9duite et montrent un noyau peu volumineux, finement et dens\u00e9ment ponctu\u00e9&nbsp;;<\/p>\n<p><span style=\"color: #999999;\">&bull; <\/span>peu volumineuses et leur noyau laisse place \u00e0 des filaments entrecrois\u00e9s&nbsp;;<\/p>\n<p><span style=\"color: #999999;\">&bull; <\/span>de taille peu importante et poss\u00e8dent un noyau en forme de b\u00e2tonnet ou de fibre, entour\u00e9 d&rsquo;une \u00e9troite couronne de cytoplasme, et parfois un <a href=\"\/codex\/glossaire\/glossaire-de-d-a-h#flagelle-n\" target=\"_blank\">flagelle<\/a>.<\/p>\n<p> &nbsp; <\/p>\n<p>De telles caract\u00e9ristiques sugg\u00e8rent que les cellules des diff\u00e9rents groupes sont \u00e0 des stades successifs d&rsquo;une \u00e9volution. En l&rsquo;occurrence, elle concerne \u00e0 la fois le noyau, la forme et le volume cellulaires.<\/p>\n<p>Il s&rsquo;agit vraisemblablement de cellules <a href=\"\/codex\/glossaire\/glossaire-de-d-a-h#germinal\" target=\"_blank\">germinales<\/a> \u00e0 diff\u00e9rents stades du processus de <a href=\"\/codex\/glossaire\/glossaire-de-d-a-h#gametogenese\" target=\"_blank\">gam\u00e9togen\u00e8se<\/a>.<br \/>\nLa pr\u00e9sence de cellules \u00e0 noyau peu volumineux, dense et homog\u00e8ne, et munies d&rsquo;un flagelle laisse \u00e0 penser que ce sont des cellules m\u00e2les en cours de <a href=\"\/codex\/glossaire\/glossaire-de-p-a-s#spermatogenese\" target=\"_blank\">spermatogen\u00e8se<\/a>, processus conduisant \u00e0 la formation de <a href=\"\/codex\/glossaire\/glossaire-de-p-a-s#spermatozoide\" target=\"_blank\">spermatozo\u00efdes<\/a>.<\/p>\n<p>Dans cette perspective, les cellules d\u00e9crites correspondent respectivement \u00e0 des <a href=\"\/codex\/glossaire\/glossaire-de-p-a-s#spermatocyte\" target=\"_blank\">spermatocytes<\/a> I avant division et en cours de premi\u00e8re division de  <a href=\"\/codex\/glossaire\/glossaire-de-i-a-o#meiose\" target=\"_blank\">m\u00e9iose<\/a>, des spermatocytes II avant division et en cours de seconde division de m\u00e9iose, et des <a href=\"\/codex\/glossaire\/glossaire-de-p-a-s#spermatide\" target=\"_blank\">spermatides<\/a> en cours de spermiogen\u00e8se.<\/p>\n<p> &nbsp; <\/p>\n<p>Des groupes de cellules germinales de m\u00eame stade, associ\u00e9es \u00e0 une masse granuleuse centrale, sont rencontr\u00e9s dans les v\u00e9sicules s\u00e9minales du Lombric notamment, <a href=\"\/codex\/glossaire\/glossaire-de-a-a-c#annelide\" target=\"_blank\">Ann\u00e9lide<\/a> oligoch\u00e8te. <\/p>\n<p>L&rsquo;<a href=\"\/codex\/glossaire\/glossaire-de-a-a-c#appareil\" target=\"_blank\">appareil<\/a> <a href=\"\/codex\/glossaire\/glossaire-de-d-a-h#genital\" target=\"_blank\">g\u00e9nital<\/a> m\u00e2le de cette esp\u00e8ce est d\u00e9crit dans les articles des semaines <a href=\"\/codex\/semaine-50-2018\">50-2018<\/a> et <a href=\"\/codex\/semaine-51-2018\">51-2018<\/a> de Codex virtualis.<\/p>\n<p>Il comporte deux paires de testicules inclus dans des sacs testiculaires. Il s&rsquo;agit de r\u00e9gions diff\u00e9renci\u00e9es des parois des cavit\u00e9s <a href=\"\/codex\/glossaire\/glossaire-de-a-a-c#coelomique\" target=\"_blank\">c\u0153lomiques<\/a>. Les sacs testiculaires sont en continuit\u00e9 avec des v\u00e9sicules s\u00e9minales au nombre de trois paires, correspondant \u00e0 des r\u00e9gions sp\u00e9cialis\u00e9es des cavit\u00e9s c\u0153lomiques.<\/p>\n<p>Les testicules produisent des groupes de <a href=\"\/codex\/glossaire\/glossaire-de-p-a-s#spermatogonie\" target=\"_blank\">spermatogonies<\/a>, associ\u00e9s chacun \u00e0 une masse centrale appel\u00e9e blastophore. L&rsquo;ensemble couronne de spermatogonies &#8211; blastophore constitue une spermatosph\u00e8re.<\/p>\n<p>Les spermatosph\u00e8res passent dans les v\u00e9sicules s\u00e9minales et les spermatogonies y donnent naissance, par mitose, \u00e0 des spermatocytes I.<br \/>\nLes spermatocytes I sont des cellules <a href=\"\/codex\/glossaire\/glossaire-de-d-a-h#diploide\" target=\"_blank\">diplo\u00efdes<\/a> qui, apr\u00e8s duplication de leurs chromosomes, subissent une m\u00e9iose. Chaque spermatocyte I est ainsi \u00e0 l&rsquo;origine de deux spermatocytes II puis quatre spermatides <a href=\"\/codex\/glossaire\/glossaire-de-d-a-h#haploide\" target=\"_blank\">haplo\u00efdes<\/a>.<br \/>\nLes spermatides, par un  processus de diff\u00e9renciation appel\u00e9 spermiogen\u00e8se, sont transform\u00e9es en spermatozo\u00efdes, <a href=\"\/codex\/glossaire\/glossaire-de-d-a-h#gamete\" target=\"_blank\">gam\u00e8tes<\/a> m\u00e2les longs et \u00e9troits portant un flagelle.<\/p>\n<p>La spermatogen\u00e8se du Lombric ainsi d\u00e9crite est d\u00e9taill\u00e9e dans les articles des semaines <a href=\"\/codex\/semaine-52-2018\">52-2018<\/a>, <a href=\"\/codex\/semaine-02-2019\">02-2019<\/a>, <a href=\"\/codex\/semaine-03-2019\">03-2019<\/a> et <a href=\"\/codex\/semaine-04-2019\">04-2019<\/a>.<\/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>Calkins G. N., 1895 &#8211; <a href=\"https:\/\/onlinelibrary.wiley.com\/doi\/abs\/10.1002\/jmor.1050110203\" target=\"_blank\">The spermatogenesis of Lumbricus.<\/a> Journal of morphology, 11, 2 : 271-302 (adresse&nbsp;: https:\/\/onlinelibrary.wiley.com\/doi\/abs\/10.1002\/jmor.1050110203)<br \/>\n<a href=\"https:\/\/doi.org\/10.1002\/jmor.1050110203 \" target=\"_blank\">DOI : 10.1002\/jmor.1050110203<\/a><\/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> &nbsp; <\/p>\n<hr \/>\n","protected":false},"excerpt":{"rendered":"<p>Une citation \u00ab\u00a0Il ne faut pas juger ce qui est possible et ce qui ne l&rsquo;est pas selon ce qui est croyable et incroyable \u00e0 notre sens.\u00a0\u00bb Montaigne &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 05-2019 r\u00e9sulte de l&rsquo;observation d&rsquo;une coupe histologique \u00e0 [&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":[47,14,23,22],"class_list":["post-11757","post","type-post","status-publish","format-standard","hentry","category-a-la-une","tag-annelide","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=\"V\u00e9sicule s\u00e9minale de Lombric avec stades de spermatogen\u00e8se (spermatides en spermiogen\u00e8se, spermatocytes I et II)\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"S. 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