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0至40周胚胎發(fā)育過(guò)程 讓人驚訝的胎兒發(fā)育過(guò)程圖片大全(6)

出處：媽媽育兒網(wǎng) 日期：2017-04-19 22:53:17 編輯：婧待花開(kāi)

胚胎發(fā)育過(guò)程圖大全

第23周-胎兒身長(zhǎng)約20厘米，體重約450克。因皮下脂肪尚未產(chǎn)生，皮膚色紅且折皺較多，皮膚的折皺是給皮下脂肪的生長(zhǎng)留有余地。胎兒的嘴唇、眉毛和眼睫毛已清晰可見(jiàn)，視網(wǎng)膜已形成，具備了微弱的視覺(jué)。胎兒的胰腺及激素的分泌穩(wěn)定發(fā)育。

胚胎發(fā)育過(guò)程圖大全

第24周-胎兒體重約有500多克，聽(tīng)力已經(jīng)形成，可以聽(tīng)到母親的各種說(shuō)話(huà)聲音，母親心跳的聲音和腸胃蠕動(dòng)的聲音及大一些的噪音胎兒也能聽(tīng)到。對(duì)一些較強(qiáng)的噪音，會(huì)使胎兒躁動(dòng)不安。

胚胎發(fā)育過(guò)程圖大全

第25周-胎兒體重穩(wěn)定增加，約有570克。皮膚很薄且有皺紋，幾乎沒(méi)有皮下脂肪，全身覆蓋著一層細(xì)細(xì)的絨毛，身體比例較為均稱(chēng)。胎兒開(kāi)始充滿(mǎn)整個(gè)子宮。胎兒舌頭上的味蕾正在形成。

胚胎發(fā)育過(guò)程圖大全

第26周-胎兒的體重在800克左右，坐高約為22厘米。皮下脂肪開(kāi)始出現(xiàn)，體形較瘦，全身覆蓋著一層細(xì)細(xì)的絨毛。胎兒開(kāi)始有了呼吸動(dòng)作，因肺部尚未發(fā)育完全，不會(huì)吸入空氣。

胎兒的大腦對(duì)觸摸已經(jīng)有了反應(yīng)，視覺(jué)也有了發(fā)展，眼睛已能夠睜開(kāi)了，視覺(jué)神經(jīng)的功能已經(jīng)發(fā)生作用。

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