Course 2
Conception
Historical Notes
Beginning of Life?
No definite answer
Egg and Sperm
Coitus
Fertilization
Segmentation
Implantation
Illustration
Multiple Pregnancies
Implantation
懷孕

植入

植入:胚泡植入子宮內膜。
Implantation:
The blastocyst implants itself in the uterine lining.

在胚泡到達子宮以後,它繼續發育3-4天,為附著到子宮內膜做好準備。受精約1周後,胚泡的這種附著便開始了,又過約1周後,胚泡已經將自己包埋進富有營養的內膜組織(子宮內膜)。胚泡將自己包埋進子宮內膜的整個過程稱為植入(也稱著床),借此妊娠便開始了。
植入只有在某些合適的條件下才能夠發生。例如,如果受精卵在發育成胚泡之前就到達了子宮,植入是不可能發生的,而且妊娠也就不能構建;如果子宮內膜未為接受胚泡做好準備,結果也是如此。在這兩種情況下,受精卵只是死亡和分解。
在一些非常罕見的例子,胚泡不是附著在子宮壁,而是附著在輸卵管內壁或子宮之外的一些其他部位(例如腹膜腔)。這種結果叫宮外孕,它不能產生活胎,並且對孕婦有危險。所以,宮外(自希臘語ek: out + topos:位置 = 不在適當的位置)孕必須做手術來終止。
Conception

Implantation

After its arrival in the uterus, the blastocyst continues to develop until, after another three to four days, it is ready to attach itself to the uterine lining. About one week after fertilization this attachment begins, and after about another week the blastocyst has completely buried itself in the nourishing tissues that cover the inner surface of the uterus (the endometrium). The entire extended process of the blastocyst burying itself in the uterine lining is called implantation, and it accomplishes pregnancy.
An implantation can occur only under certain proper conditions. For example, if the zygote should reach the uterus before it has developed into a blastocyst, no implantation is possible and pregnancy cannot be established. The same is true if the uterine lining is not prepared to receive the blastocyst. In both cases, the cell cluster will simply die and disintegrate.
In some very rare instances, the blastocyst will attach itself not to the uterine wall but to the inside of the Fallopian tube or some other place outside the uterus, i.e., in the abdominal cavity. The result is called ectopic pregnancy, which cannot produce a live child and is dangerous to the woman. Therefore, ectopic (Greek ek: out + topos: place = out of place) pregnancies have to be terminated by surgery.

[Course 2] [Description] [How to use it] [Introduction] [Conception] [Historical Notes] [Beginning of Life?] [No definite answer] [Egg and Sperm] [Coitus] [Fertilization] [Segmentation] [Implantation] [Multiple Pregnancies] [Pregnancy] [Birth] [Infertility] [Contraception] [Abortion] [Additional Reading] [Examination]