{"id":10839,"date":"2018-04-09T17:04:24","date_gmt":"2018-04-09T15:04:24","guid":{"rendered":"https:\/\/codexvirtualis.fr\/codex\/?p=10839"},"modified":"2018-04-07T19:21:09","modified_gmt":"2018-04-07T17:21:09","slug":"semaine-15-2018","status":"publish","type":"post","link":"https:\/\/codexvirtualis.fr\/codex\/semaine-15-2018","title":{"rendered":"Semaine 15-2018"},"content":{"rendered":"

Une citation<\/h2>\n

\u00ab\u00a0Pour obtenir ce que l’on veut de la vie, il faut absolument commencer par le commencement\u00a0: savoir ce que l’on veut.\u00a0\u00bb<\/p>\n

B. Stein<\/p>\n

  <\/p>\n

Une image<\/h2>\n
\"Quel<\/a>
Quel est cet organe ?<\/figcaption><\/figure>\n

  <\/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 15-2018 r\u00e9sulte de l’observation d’une coupe histologique \u00e0 l’objectif x10 du microscope photonique.<\/p>\n

Elle appara\u00eet constitu\u00e9e de deux structures ovales et massives accol\u00e9es, au sein desquelles des unit\u00e9s circulaires sont pr\u00e9sentes, localis\u00e9es autour d’une masse fibreuse.
\nL’ensemble est entour\u00e9 d’une tunique form\u00e9e de fibres de dimensions diverses, comportant localement des sections circulaires poss\u00e9dant une lumi\u00e8re remplie d’une masse uniforme.<\/p>\n

  <\/p>\n

Les unit\u00e9s circulaires situ\u00e9es en p\u00e9riph\u00e9rie des structures accol\u00e9es poss\u00e8dent une ponctuation centrale claire correspondant \u00e0 un noyau. Il s’agit de corps cellulaires de divers types, comme le r\u00e9v\u00e8le la diversit\u00e9 des couleurs de leurs cytoplasmes.
\nLa masse fibreuse centrale regroupe de fines expansions \u00e9manant des corps cellulaires.
\nLes cellules form\u00e9es d’un corps cellulaire reli\u00e9 \u00e0 de fines expansions correspondent \u00e0 des neurones, cellules du syst\u00e8me nerveux. Leurs expansions sont appel\u00e9es fibres nerveuses.
\nLe c\u0153ur fibreux, principalement constitu\u00e9 de fibres nerveuses, porte le nom de neuropile<\/a>. <\/p>\n

L’enveloppe fibreuse entourant les structures accol\u00e9es est form\u00e9e de fibres musculaires lisses associ\u00e9es \u00e0 du tissu conjonctif<\/a> fibreux dans lequel des vaisseaux sanguins sont pr\u00e9sents.<\/p>\n

  <\/p>\n

L’organisation ainsi d\u00e9crite, comprenant des corps cellulaires de neurone et du neuropile, est caract\u00e9ristique des centres nerveux. La localisation p\u00e9riph\u00e9rique des corps cellulaires et l’accolement de deux massifs semblables sugg\u00e8re qu’il s’agit de ganglions nerveux d’animaux non Vert\u00e9br\u00e9s. En l’occurrence, il s’agit des ganglions ant\u00e9rieurs et dorsaux du syst\u00e8me nerveux du Lombric ou Ver de terre, une Ann\u00e9lide oligoch\u00e8te.
\nIls portent le nom de ganglions c\u00e9r\u00e9bro\u00efdes.<\/p>\n

  <\/p>\n

Le tissu nerveux<\/a> constituant le syst\u00e8me nerveux assure le traitement des informations dans les organismes animaux. Il consiste en la r\u00e9ception, l’acheminement, l’int\u00e9gration et la production des informations.
\nLes neurones sont des cellules excitables, propri\u00e9t\u00e9 leur permettant de r\u00e9aliser ce traitement. <\/p>\n

Du point de vue anatomique, les r\u00e9cepteurs sensoriels sont le si\u00e8ge de la sensibilit\u00e9 ou r\u00e9ception des informations, les nerfs sont responsables de l’acheminement des informations et les centres nerveux de l’int\u00e9gration. Les neurones y sont nombreux et de multiples synapses, sites de transmission intercellulaire de l’information nerveuse, sont localis\u00e9es dans le neuropile.<\/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

  <\/p>\n

\n","protected":false},"excerpt":{"rendered":"

Une citation \u00ab\u00a0Pour obtenir ce que l’on veut de la vie, il faut absolument commencer par le commencement\u00a0: savoir ce que l’on veut.\u00a0\u00bb B. Stein   Une image   Voir l’image de plus grande taille   Voir l’image l\u00e9gend\u00e9e   L’image de la semaine 15-2018 r\u00e9sulte de l’observation d’une coupe histologique \u00e0 l’objectif x10 du […]<\/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-10839","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\/10839","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=10839"}],"version-history":[{"count":14,"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/posts\/10839\/revisions"}],"predecessor-version":[{"id":10865,"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/posts\/10839\/revisions\/10865"}],"wp:attachment":[{"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/media?parent=10839"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/categories?post=10839"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/tags?post=10839"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}