It consists in collecting mature oocytes (eggs) produced by the
ovaries and putting them into direct contact with the
partner's spermatozoa,
outside of the female body (the denomination "in vitro" and "test
tube baby").
After its fertilization, the egg will lead to the formation of
an early embryo by successive cell divisions. This embryo
will be replaced in
the womb (= uterus), hopefully leading to a viable pregnancy.
