CHRISTIAN DARKIN / SCIENCE PHOTO LIBRARY CHRISTIAN DARKIN / SCIENCE PHOTO LIBRARY
In vitro fertilization. Image 1 of 4. Computer artwork of an egg cell (centre) held in place by a tube (left) and about to be pierced by a micro- needle (right) to inject a single sperm cell. This type of in vitro fertilization (IVF) is known as intra-cytoplasmic sperm injection (ICSI). The sperm cell fertilizes the egg cell and the zygote that forms is cultured until it reaches an early stage of embryonic development. It is then placed in the uterine wall, allowing pregnancy to proceed as normal. IVF treatment enables couples with any of a range of infertility problems to conceive a child. For the early stages of development after fertilization, see images M802 238-240.
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