Implantation (human embryo)
![Fertilization in humans. The sperm and ovum unite through fertilization, creating a conceptus that (over the course of 8-9 days) will implant in the uterine wall, where it will reside over the course of 9 months.](/Images/godic/202501/29/Human_Fertilization5934.png")
In humans (as in all other mammals, except for monotremes), implantation is the very early stage of pregnancy at which the conceptus adheres to the wall of the uterus. At this stage of prenatal development, the conceptus is a blastocyst. It is by this adhesion that the foetus receives oxygen and nutrients from the mother to be able to grow.