The tiny oocyte moves along the fallopian tube.

微小的细胞沿输管运动。

Meanwhile, the primordial follicle turns into a primary follicle, meaning that the follicular cells that surrounding the primary oocyte develop into granulosa cells.

与此同时，包围初级细胞的滤泡细胞分化为颗粒细胞，使始基泡变为初级泡。

So next month Dr Tilly will take some of his stem cell booty to Edinburgh to collaborate with Evelyn Telfer, who has developed a technique for growing human eggs from an early stage.

所以，下月Tilly博士将带着细胞去爱丁堡与Evelyn Telfer合作。Evelyn Telfer掌握了用细胞培育细胞的技术。

In fact, sometimes only a dozen or so of the original millions make it through all those trials to actually reach an oocyte.

事实上，有时候几百万细胞中只有一打左右通过了所有这些试验最终得到了细胞。

Each primordial follicle has a single immature sex cell called the primary oocyte at the core, and a layer of follicular cells surrounds this.

每一始基泡中心都有一未成熟的殖细胞，叫做初级细胞，被泡细胞包裹。

But for now, you learned all about female reproductive anatomy, how sex hormones affect oogenesis and ovulation, and how the ovarian and menstrual cycles mature and release oocytes, and create a comfy uterine environment for a fertilized egg.

但是现在，你了解了女性殖解学，性激素如何影响子发和排，巢和月经周期如何成熟和释放细胞，并为受精创造舒适的子宫环境。

The first part is the fimbriae which are the finger-like projections that surround the ovary and guide the secondary oocyte into the fallopian tube.

首先经过的是输管的伞部，呈指状突起，包围着巢，并且可以引导次级细胞进入输管。

That oocyte has a window of about a day, or less, to meet a sperm before it's no longer viable. But, that being said, sperm can persist in the female reproductive tract for as much as 3-5 days.

细胞有大约一天或更短的时间在精子不再存活之前与精子相遇。但是，话虽如此，精子可以在女性殖道中持续 3-5 天。

If fertilization occurs - meaning if a sperm meets the secondary oocyte - then the corpus luteum continues making progesterone until the placenta forms.

如果这时候受精，精子遇到次级细胞，黄体会持续地分泌黄体酮，直到胎盘形成。

They also prepare the uterus to receive the oocyte, which is now on its way down a fallopian tube, where it might meet a nice young sperm.

它们还准备子宫接收细胞，细胞现在正在输管中，在那里它可能会遇到一好的年轻精子。

In a graafian follicle, a central cavity called the antrum forms within the follicle, and the granulosa cells secrete a nourishing fluid for the primary oocyte directly into that antrum.

格拉夫泡的中间会形成一空腔叫做泡腔，而颗粒细胞会为初级细胞分泌营养液，直接排入泡腔。

The LH gets to work on the oocyte that's been dormant inside the follicle, and triggers it to finally start dividing again — getting it to complete meiosis I and move on to metaphase II.

LH 开始作用于泡内休眠的细胞，并触发它最终再次开始分裂——让它完成减数分裂 I 并进入中期 II。

After ovulation, the secondary oocyte makes a very quick journey through the peritoneal space and lands in the fallopian tube.

排之后，次级细胞会快速地通过腹膜，最后落入输管。

Remember that the " egg" is still just a secondary oocyte here, and hasn't completed meiosis. As the sperm delivers its payload, it causes a flash of calcium ions from the oocyte's endoplasmic reticulum.

请记住，“子”在这里仍然只是一次级细胞，还没有完成减数分裂。当精子传递其有效载荷时，它会从细胞的内质网中产钙离子闪光。

To do this, the primary oocytes have to complete meiosis 1, and in a person's lifetime only about 400 successfully do that.

要变成配子就必须要经历第一次减数分裂，而一人的一中大概只有400初级细胞可以做到。

Once it's past that, it runs into the zona pellucida, a layer of glycoprotein that covers the oocyte's plasma membrane.

一旦过了这阶段，它就进入透明带，覆盖细胞质膜的一层糖蛋白。

The ovaries contain follicles, which contain oocytes, which are immature eggs and surrounding cells.

巢中含有泡，泡中包含细胞，这是未成熟的子及其周围的细胞。

Over time, staying in that frozen state of miosis gradually means there's more and more possibility of poor egg quality, meaning when they do start cell division again, they have a higher chance of making mistakes in that process.

随着时间推移， 细胞长期处于这种停滞的减数分裂状态， 逐渐意味着子质量下降的可能性越来越大，这意味着当它们再次开始细胞分裂时，在此过程中出错的几率更高。

So some of her ovocytes were carrying her own genetic signature, and some of the ovocytes were carrying her sister's genetic signatures.

因此，她的一些细胞携带了她自己的遗传特征，而另一些细胞则携带了她姐妹的遗传特征。

If fertilization doesn't happen, then the corpus luteum stops making hormones after around 10 days, becomes fibrotic, and is called the corpus albicans.

如果次级细胞没有受精，大概10天之后，黄体就会停止释放激素而纤维化，形成白体。