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The Menstrual Cycle With Fertilization. From The Top To The Bottom Ovarian Cycle, Hormonal Cycle And Uterine Cycle. The Menstrual Cycle Is Divided Into Two Phases The Follicular Phase Or Proliferative, Pre Ovulatory, The Luteal Phase Or Secretory, Post Ovulatory. The Follicular Phase :Inside The Ovary, The Ovarian Follicles, Carrying The Ovocytes, Develop Primordial Follicle, Primary, Secondary And Tertiary. At The Same Time, The Hypothalamic Hormone Gnrh Provokes The Cyclic Secretion Of Two Hypophyseal Hormones, The Gonadotrophins Lh Luteinizing Hormone And Fsh Follicle Stimulating Hormone. The Fsh In Green Enables The Evolution Of The Ovarian Follicles And Assures The Maturation Of A Graafian Follicule By Cycle. On The Fourteenth Day Of The Cycle, The Simultaneous Release Of A Strong Dose Of Fsh And Lh In Light Blue Into The Blood Trigger Ovulation A Mature Tertiary Follicle Or Graafian Follicle Ejects The Ovocyte Ii It Contains. At The Level Of The Uterus, The Endometrium Is Preparing To Receive A Possible Embryo It Thickens And The Uterine Glands Develop. The Luteal Phase :Inside The Ovary, Under The Action Of Lh, The Graafian Follicle Emptyied Of Its Content, Or Dehiscent Follicle, Degenerates Into Corpus Luteum ; It Is Follicular Atresia. The Combined Action Of Lh And Fsh Is Responsible For The Secretion Of Estrogen And Progesterone By The Corpus Luteum. The Endometrium Pursues Its Maturation, And The Uterine Glands Secrete Glycogen For The Possible Nutrition Of The Futur Embryo. The Beginning Of Pregnancy :In Case Of Fertilization, The Ovum Becomes A Zygote Then An Embryo, That Starts Its Development While Transiting Into The Fallopian Tube, Heading Towards The Uterus. The Embryo Then Produces An Hormone, The Hcg, That Enables The Maintain Of The Corpus Luteum, And Then The Synthesis Of Estrogen And Progesterone. The Adequate Equilibrium Of Hormones Enables The (Photo By BSIP/UIG Via Getty Images)