http://pp.sohu.com/user/1433573 搜狐博客 http://pp.sohu.com/styles/home/images/ppLogo.gif http://pp.sohu.com/ 100 43 搜狐博客-相册 http://pp.sohu.com/photoview-12372629-1433573.html#12372629 tang1980_ 2006-08-03 18:35 http://pp.sohu.com/photoview-12372629-1433573.html#12372629 ？三、卵子经过大约15厘米长的、狭窄的输卵管向子宫游动，它周围的营养细胞像一串串美丽的光环围绕着它。很快，它将与精子相遇并开始受精的过程。 ]]> http://pp.sohu.com/photoview-12372628-1433573.html#12372628 tang1980_ 2006-08-03 18:35 http://pp.sohu.com/photoview-12372628-1433573.html#12372628 一、精子，在性交过程中，大约有3亿精子可能会进入阴道。 ]]> http://pp.sohu.com/photoview-12372626-1433573.html#12372626 tang1980_ 2006-08-03 18:35 http://pp.sohu.com/photoview-12372626-1433573.html#12372626 ]]> http://pp.sohu.com/photoview-12372625-1433573.html#12372625 tang1980_ 2006-08-03 18:35 http://pp.sohu.com/photoview-12372625-1433573.html#12372625 ]]> http://pp.sohu.com/photoview-12372624-1433573.html#12372624 tang1980_ 2006-08-03 18:35 http://pp.sohu.com/photoview-12372624-1433573.html#12372624 ]]> http://pp.sohu.com/photoview-12372623-1433573.html#12372623 tang1980_ 2006-08-03 18:35 http://pp.sohu.com/photoview-12372623-1433573.html#12372623 ]]> http://pp.sohu.com/photoview-12372622-1433573.html#12372622 tang1980_ 2006-08-03 18:35 http://pp.sohu.com/photoview-12372622-1433573.html#12372622 ]]> http://pp.sohu.com/photoview-12372620-1433573.html#12372620 tang1980_ 2006-08-03 18:35 http://pp.sohu.com/photoview-12372620-1433573.html#12372620 ]]> http://pp.sohu.com/photoview-12372619-1433573.html#12372619 tang1980_ 2006-08-03 18:35 http://pp.sohu.com/photoview-12372619-1433573.html#12372619 ？七、受精后8天，胚芽完成“着陆”，微微嵌入子宫内膜，此时它分裂发育为几百个细胞。 ]]> http://pp.sohu.com/photoview-12372616-1433573.html#12372616 tang1980_ 2006-08-03 18:35 http://pp.sohu.com/photoview-12372616-1433573.html#12372616 ？六、第1周，在受精之后几小时之内，受精卵开始分裂。1周以后，这个小圆球将自己附着在子宫壁上。 ]]> http://pp.sohu.com/photoview-12372615-1433573.html#12372615 tang1980_ 2006-08-03 18:35 http://pp.sohu.com/photoview-12372615-1433573.html#12372615 ？五、此时精子的头已经钻进去了，我们还可以看到它的中部和尾部，它就像一个不断旋转的钻头，在尾部拍打的驱动下，努力进入卵子。 ]]> http://pp.sohu.com/photoview-12372614-1433573.html#12372614 tang1980_ 2006-08-03 18:35 http://pp.sohu.com/photoview-12372614-1433573.html#12372614 四、一个精子试图进入卵子的瞬间。 ]]> http://pp.sohu.com/photoview-12372612-1433573.html#12372612 tang1980_ 2006-08-03 18:35 http://pp.sohu.com/photoview-12372612-1433573.html#12372612 二、但是只有一个精子可能穿过重重障碍，使卵子受精，最终制造出一个胚胎。 ]]> http://pp.sohu.com/photoview-12372610-1433573.html#12372610 tang1980_ 2006-08-03 18:35 http://pp.sohu.com/photoview-12372610-1433573.html#12372610 ]]>