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Available in 40 languages" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-40" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">40 languages</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D9%83%D9%8A%D8%B3%D8%A9_%D8%A3%D8%B1%D9%8A%D9%85%D9%8A%D8%A9" title="كيسة أريمية – Arabic" lang="ar" hreflang="ar" data-title="كيسة أريمية" data-language-autonym="العربية" data-language-local-name="Arabic" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-be mw-list-item"><a href="https://be.wikipedia.org/wiki/%D0%91%D0%BB%D0%B0%D1%81%D1%82%D0%B0%D1%86%D1%8B%D1%81%D1%82%D0%B0" title="Бластацыста – Belarusian" lang="be" hreflang="be" data-title="Бластацыста" data-language-autonym="Беларуская" data-language-local-name="Belarusian" class="interlanguage-link-target"><span>Беларуская</span></a></li><li class="interlanguage-link interwiki-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/%D0%91%D0%BB%D0%B0%D1%81%D1%82%D0%BE%D1%86%D0%B8%D1%81%D1%82" title="Бластоцист – Bulgarian" lang="bg" hreflang="bg" data-title="Бластоцист" data-language-autonym="Български" data-language-local-name="Bulgarian" class="interlanguage-link-target"><span>Български</span></a></li><li class="interlanguage-link interwiki-bs mw-list-item"><a href="https://bs.wikipedia.org/wiki/Blastocist" title="Blastocist – Bosnian" lang="bs" hreflang="bs" data-title="Blastocist" data-language-autonym="Bosanski" data-language-local-name="Bosnian" class="interlanguage-link-target"><span>Bosanski</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Blastocist" title="Blastocist – Catalan" lang="ca" hreflang="ca" data-title="Blastocist" data-language-autonym="Català" data-language-local-name="Catalan" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Blastocysta" title="Blastocysta – Czech" lang="cs" hreflang="cs" data-title="Blastocysta" data-language-autonym="Čeština" data-language-local-name="Czech" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Blastocyste" title="Blastocyste – German" lang="de" hreflang="de" data-title="Blastocyste" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/Blastots%C3%BCst" title="Blastotsüst – Estonian" lang="et" hreflang="et" data-title="Blastotsüst" data-language-autonym="Eesti" data-language-local-name="Estonian" class="interlanguage-link-target"><span>Eesti</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/Blastocyst" title="Blastocyst – English" lang="en" hreflang="en" data-title="Blastocyst" data-language-autonym="English" data-language-local-name="English" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D8%A8%D9%84%D8%A7%D8%B3%D8%AA%D9%88%D8%B3%DB%8C%D8%B3%D8%AA" title="بلاستوسیست – Persian" lang="fa" hreflang="fa" data-title="بلاستوسیست" data-language-autonym="فارسی" data-language-local-name="Persian" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Blastocyste" title="Blastocyste – French" lang="fr" hreflang="fr" data-title="Blastocyste" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-ga mw-list-item"><a href="https://ga.wikipedia.org/wiki/Blastaicist" title="Blastaicist – Irish" lang="ga" hreflang="ga" data-title="Blastaicist" data-language-autonym="Gaeilge" data-language-local-name="Irish" class="interlanguage-link-target"><span>Gaeilge</span></a></li><li class="interlanguage-link interwiki-gl mw-list-item"><a href="https://gl.wikipedia.org/wiki/Blastocisto" title="Blastocisto – Galician" lang="gl" hreflang="gl" data-title="Blastocisto" data-language-autonym="Galego" data-language-local-name="Galician" class="interlanguage-link-target"><span>Galego</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EC%A3%BC%EB%A8%B8%EB%8B%88%EB%B0%B0" title="주머니배 – Korean" lang="ko" hreflang="ko" data-title="주머니배" data-language-autonym="한국어" data-language-local-name="Korean" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/%D4%B2%D5%AC%D5%A1%D5%BD%D5%BF%D5%B8%D6%81%D5%AB%D5%BD%D5%BF" title="Բլաստոցիստ – Armenian" lang="hy" hreflang="hy" data-title="Բլաստոցիստ" data-language-autonym="Հայերեն" data-language-local-name="Armenian" class="interlanguage-link-target"><span>Հայերեն</span></a></li><li class="interlanguage-link interwiki-hi mw-list-item"><a href="https://hi.wikipedia.org/wiki/%E0%A4%AC%E0%A5%8D%E0%A4%B2%E0%A4%BE%E0%A4%B8%E0%A5%8D%E0%A4%9F%E0%A5%8B%E0%A4%B8%E0%A4%BF%E0%A4%B8%E0%A5%8D%E0%A4%9F" title="ब्लास्टोसिस्ट – Hindi" lang="hi" hreflang="hi" data-title="ब्लास्टोसिस्ट" data-language-autonym="हिन्दी" data-language-local-name="Hindi" class="interlanguage-link-target"><span>हिन्दी</span></a></li><li class="interlanguage-link interwiki-hr mw-list-item"><a href="https://hr.wikipedia.org/wiki/Blastocista" title="Blastocista – Croatian" lang="hr" hreflang="hr" data-title="Blastocista" data-language-autonym="Hrvatski" data-language-local-name="Croatian" class="interlanguage-link-target"><span>Hrvatski</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Blastosis" title="Blastosis – Indonesian" lang="id" hreflang="id" data-title="Blastosis" data-language-autonym="Bahasa Indonesia" data-language-local-name="Indonesian" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Blastocisti" title="Blastocisti – Italian" lang="it" hreflang="it" data-title="Blastocisti" data-language-autonym="Italiano" data-language-local-name="Italian" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/%D7%91%D7%9C%D7%A1%D7%98%D7%95%D7%A6%D7%99%D7%A1%D7%98" title="בלסטוציסט – Hebrew" lang="he" hreflang="he" data-title="בלסטוציסט" data-language-autonym="עברית" data-language-local-name="Hebrew" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-kk mw-list-item"><a href="https://kk.wikipedia.org/wiki/%D2%B0%D1%80%D1%8B%D2%9B_%D0%BA%D3%A9%D0%BF%D1%96%D1%80%D1%88%D1%96%D0%B3%D1%96" title="Ұрық көпіршігі – Kazakh" lang="kk" hreflang="kk" data-title="Ұрық көпіршігі" data-language-autonym="Қазақша" data-language-local-name="Kazakh" class="interlanguage-link-target"><span>Қазақша</span></a></li><li class="interlanguage-link interwiki-la mw-list-item"><a href="https://la.wikipedia.org/wiki/Blastocystis" title="Blastocystis – Latin" lang="la" hreflang="la" data-title="Blastocystis" data-language-autonym="Latina" data-language-local-name="Latin" class="interlanguage-link-target"><span>Latina</span></a></li><li class="interlanguage-link interwiki-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/Blasztociszta" title="Blasztociszta – Hungarian" lang="hu" hreflang="hu" data-title="Blasztociszta" data-language-autonym="Magyar" data-language-local-name="Hungarian" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Blastocyste" title="Blastocyste – Dutch" lang="nl" hreflang="nl" data-title="Blastocyste" data-language-autonym="Nederlands" data-language-local-name="Dutch" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E8%83%9A%E7%9B%A4%E8%83%9E" title="胚盤胞 – Japanese" lang="ja" hreflang="ja" data-title="胚盤胞" data-language-autonym="日本語" data-language-local-name="Japanese" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Blastocyst" title="Blastocyst – Norwegian Bokmål" lang="nb" hreflang="nb" data-title="Blastocyst" data-language-autonym="Norsk bokmål" data-language-local-name="Norwegian Bokmål" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-uz mw-list-item"><a href="https://uz.wikipedia.org/wiki/Blastotsista" title="Blastotsista – Uzbek" lang="uz" hreflang="uz" data-title="Blastotsista" data-language-autonym="Oʻzbekcha / ўзбекча" data-language-local-name="Uzbek" class="interlanguage-link-target"><span>Oʻzbekcha / ўзбекча</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Blastocysta" title="Blastocysta – Polish" lang="pl" hreflang="pl" data-title="Blastocysta" data-language-autonym="Polski" data-language-local-name="Polish" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%91%D0%BB%D0%B0%D1%81%D1%82%D0%BE%D1%86%D0%B8%D1%81%D1%82%D0%B0" title="Бластоциста – Russian" lang="ru" hreflang="ru" data-title="Бластоциста" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-sk mw-list-item"><a href="https://sk.wikipedia.org/wiki/Blastocysta" title="Blastocysta – Slovak" lang="sk" hreflang="sk" data-title="Blastocysta" data-language-autonym="Slovenčina" data-language-local-name="Slovak" class="interlanguage-link-target"><span>Slovenčina</span></a></li><li class="interlanguage-link interwiki-ckb mw-list-item"><a href="https://ckb.wikipedia.org/wiki/%D8%A8%D9%84%D8%A7%D8%B3%D8%AA%DB%86%DA%86%DB%8C%DA%A9%DA%B5%D8%AF%D8%A7%D9%86%DB%95" title="بلاستۆچیکڵدانە – Central Kurdish" lang="ckb" hreflang="ckb" data-title="بلاستۆچیکڵدانە" data-language-autonym="کوردی" data-language-local-name="Central Kurdish" class="interlanguage-link-target"><span>کوردی</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/%D0%91%D0%BB%D0%B0%D1%81%D1%82%D0%BE%D1%86%D0%B8%D1%81%D1%82" title="Бластоцист – Serbian" lang="sr" hreflang="sr" data-title="Бластоцист" data-language-autonym="Српски / srpski" data-language-local-name="Serbian" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-sh mw-list-item"><a href="https://sh.wikipedia.org/wiki/Blastocist" title="Blastocist – Serbo-Croatian" lang="sh" hreflang="sh" data-title="Blastocist" data-language-autonym="Srpskohrvatski / српскохрватски" data-language-local-name="Serbo-Croatian" class="interlanguage-link-target"><span>Srpskohrvatski / српскохрватски</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Alkiorakkula" title="Alkiorakkula – Finnish" lang="fi" hreflang="fi" data-title="Alkiorakkula" data-language-autonym="Suomi" data-language-local-name="Finnish" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Blastocyst" title="Blastocyst – Swedish" lang="sv" hreflang="sv" data-title="Blastocyst" data-language-autonym="Svenska" data-language-local-name="Swedish" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-tg mw-list-item"><a href="https://tg.wikipedia.org/wiki/%D0%91%D0%BB%D0%B0%D1%81%D1%82%D0%BE%D1%81%D0%B8%D1%81%D1%82%D0%B0" title="Бластосиста – Tajik" lang="tg" hreflang="tg" data-title="Бластосиста" data-language-autonym="Тоҷикӣ" data-language-local-name="Tajik" class="interlanguage-link-target"><span>Тоҷикӣ</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Blastokist" title="Blastokist – Turkish" lang="tr" hreflang="tr" data-title="Blastokist" data-language-autonym="Türkçe" data-language-local-name="Turkish" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%91%D0%BB%D0%B0%D1%81%D1%82%D0%BE%D1%86%D0%B8%D1%81%D1%82%D0%B0" title="Бластоциста – Ukrainian" lang="uk" hreflang="uk" data-title="Бластоциста" data-language-autonym="Українська" data-language-local-name="Ukrainian" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/Ph%C3%B4i_nang" title="Phôi nang – Vietnamese" lang="vi" hreflang="vi" data-title="Phôi nang" data-language-autonym="Tiếng Việt" data-language-local-name="Vietnamese" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E8%83%9A%E8%83%9E" title="胚胞 – Chinese" lang="zh" hreflang="zh" data-title="胚胞" data-language-autonym="中文" data-language-local-name="Chinese" class="interlanguage-link-target"><span>中文</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q227717#sitelinks-wikipedia" title="Edit interlanguage links" class="wbc-editpage">Change links</a></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div id="left-navigation"> <nav aria-label="Namespaces"> <div id="p-associated-pages" class="vector-menu vector-menu-tabs mw-portlet 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id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Diagram_of_Blastocyst_stage.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/9/9e/Diagram_of_Blastocyst_stage.png/220px-Diagram_of_Blastocyst_stage.png" decoding="async" width="220" height="167" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/9e/Diagram_of_Blastocyst_stage.png/330px-Diagram_of_Blastocyst_stage.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/9e/Diagram_of_Blastocyst_stage.png/440px-Diagram_of_Blastocyst_stage.png 2x" data-file-width="671" data-file-height="509" /></a><figcaption></figcaption></figure> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Human_blastocyst.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/7/7b/Human_blastocyst.jpg/220px-Human_blastocyst.jpg" decoding="async" width="220" height="221" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/7/7b/Human_blastocyst.jpg 1.5x" data-file-width="246" data-file-height="247" /></a><figcaption>Human blastocyst, with inner cell mass</figcaption></figure> <p>The <b>blastocyst</b> is a stage of development that occurs in most <a href="/wiki/Mammal" title="Mammal">mammals</a>. The blastocyst has two basic types of cells. One of them is called <a href="/w/index.php?title=Inner_cell_mass&action=edit&redlink=1" class="new" title="Inner cell mass (not yet started)">inner cell mass</a>. This will form the <a href="/wiki/Embryo" title="Embryo">embryo</a>. The outer layer of cells will form the two membranes which surround the embryo. </p><p>In humans, the blastocyst starts to form about five days after fertilization. About seven days after fertilization, the blastocyst attaches itself to the wall of the <a href="/wiki/Uterus" title="Uterus">uterus</a>. </p><p>With <a href="/wiki/In_vitro_fertilisation" title="In vitro fertilisation">in vitro fertilization</a>, the fertilized egg gets transferred to the uterus. When this is done it is two to three days after fertilization. It is difficult to predict which eggs will develop best. For this reason, several are usually transferred to the uterus. Often this leads to multiple pregnancies (multiple eggs developing into embryos). When a blastocyst is transferred, five to six days after fertilization, this problem does not occur. It is also easier to transfer a blastocyst and attach it to the wall of the uterus. </p><p><br /> </p> <div class="boilerplate metadata plainlinks" id="stub"><span typeof="mw:File"><a href="/wiki/File:Morpho_menelaus_huebneri_MHNT_Male_Dos.jpg" class="mw-file-description"><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/2/23/Morpho_menelaus_huebneri_MHNT_Male_Dos.jpg/30px-Morpho_menelaus_huebneri_MHNT_Male_Dos.jpg" decoding="async" width="30" height="24" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/2/23/Morpho_menelaus_huebneri_MHNT_Male_Dos.jpg/45px-Morpho_menelaus_huebneri_MHNT_Male_Dos.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/2/23/Morpho_menelaus_huebneri_MHNT_Male_Dos.jpg/60px-Morpho_menelaus_huebneri_MHNT_Male_Dos.jpg 2x" data-file-width="4468" data-file-height="3578" /></a></span> <i>This <a href="/wiki/Wikipedia:Stub" title="Wikipedia:Stub">short article</a> about <a href="/wiki/Category:Biology_stubs" title="Category:Biology stubs">biology</a> can be made longer. 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