受精膜 fertilization membrane

互联网2013-11-15

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　　指受精后在卵的外表面所形成的膜，多见于海生动物。例如海胆，其透明的受精膜是从精子的钻入点开始分离，几十秒钟内即可从卵的整个表面分离。开始是柔软的，但数分钟后则变硬。海胆受精膜的前身是未受精卵表面的卵黄膜，受精时，随着表层的变化而从卵的表面分离。这时，此膜即可与崩溃的卵表层颗粒所释放的物质和海水中的钙等结合变厚变硬，最后成为受精膜。它在胚孵化以前具有保护膜的作用。孵化时，可被孵化酶溶解。

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