GILLES / SCIENCE PHOTO LIBRARY GILLES / SCIENCE PHOTO LIBRARY
FERTILIZATION DRAWING Ovarian cycle, ovulation, fertilization, segmentation of the embryo and nidation. Ovary in cut-away view with different stages of the ovarian cycle : primordial follicle, primary follicle, secondary follicle, tertiary follicle, Graafian follicle, ovulation (Graafian follicle ejecting the ovocyte II it contains), follicular atresia in corpus luteum. Ovulation : the ovocyte II released by the Graafian follicle is captured by the infundibulum of the Fallopian tube. Fertilization : at the level of the Fallopian tube, the ovum is fertilized by a spermatozoa. Segmentation (succession of cellular divisions) of the egg into an embryo of various cells, while it transits into the Fallopian tube. Nidation of the embryon (blastocyst stage) in the uterine endometrium.
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