Fertilized human egg (zygote) having split into eight cells.

Fertilized human egg during pronucleate stage. Egg has enlarged but is still at single cell stage prior to first cleavage.

Fertilized human egg (zygote) having reached the blastocyst stage. Zygote contains a fluid filled blastocele is preparing for implantation into endometrium of uterus.

Sagittal view of female pelvic and abdominal regions showing common sites (dots) of endometriosus formation.

Female pelvis, median section

(Top) Chart illustrating plasma hormone concentrations in the normal female reproductive cycle. (Bottom) Illustration depicting the ovarian events and uterine changes during the menstrual cycle.

Anterior view of the female genitourinary system, including the ovaries, uterine tubes, uterus and bladder.

the various possible locations of an ectopic pregnancy within the uterus, ovaries and fallopian tubes.

Ovary and uterine tube