Egg cell fertilisation CGI image.  Artistic representation of sperm and egg.   During fertilization, the sperm and egg unite in one of the fallopian tubes to form a zygote. Then the zygote travels down the fallopian tube, where it becomes a morula. Once it reaches the uterus, the morula becomes a blastocyst. The blastocyst then burrows into the uterine lining — a process called implantation. Polymime is a UK based animation company offering royalty free medical stock images and medical stock videos.  Other services including 3D rending, medical animation interactive 3D, vfx and more.