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This Concept Map, created with IHMC CmapTools, has information related to: 30d. Menstrual Cycle, MENSTRUAL CYCLE Reference Female reproductive system, Endometrium shrinks causes Compression of Spiral arteries, Menstrual Phase (Days 1-4) -Non fertilized egg characterized by Corpus luteum shuts down, Early seretory Phase (Days 15-24) -See rise in estrogen & progesterone -Negative feedback to pituitary, hypothalimus (Turns off production of FSH & LH) during this stage Endometrial glands become sacculated, Compression of Spiral arteries leads to Vasospasms, Endometria glands are straight and Glycogen accumulates in basal cytoplasm, Corpus luteum shuts down causes reduction in Progesterone, Follicular phase of ovary at this stage Estrogen comes from follicles, Corpus luteum shuts down causes reduction in Estrogen, MENSTRUAL CYCLE happens After ovulation, MENSTRUAL CYCLE occurs in pases Late Scretory Phase (Days 25-28), Proliferative Phase (Days 5-14) Duration is variable -Spike in estrogen day 12.5 Causes feed forward activation -Spike in LH day 13.5 leads to ovulation during this stage Endometria glands are straight, Loss of functional layer -Sloughed off as discharges (menses) actually comes off in Patches, Fibrinolysin also seen in Male system, Menstrual Phase (Days 1-4) -Non fertilized egg characterized by Loss of functional layer -Sloughed off as discharges (menses), Early seretory Phase (Days 15-24) -See rise in estrogen & progesterone -Negative feedback to pituitary, hypothalimus (Turns off production of FSH & LH) during this stage Endometrium thickens (edema), MENSTRUAL CYCLE for pictoral summary Click here!, Late Scretory Phase (Days 25-28) during this stage Endometrium shrinks, Corpus luteum is up and running and Secretes progesterone, Patches special note, clotting inhibited by Fibrinolysin