NR507 FINAL EXAM STUDY GUIDE 3.

Endometrial cycle and occurrence of ovulation Manifestation of female reproductive functioning is menstrual bleeding, which starts with menarche (1st period) and ends with menopause (cessation of menstrual flow for 1 y ...

Endometrial cycle and occurrence of ovulation Manifestation of female reproductive functioning is menstrual bleeding, which starts with menarche (1st period) and ends with menopause (cessation of menstrual flow for 1 year). Average age of menarche is 12 with a range of 9-17. Appears to be r/t body weight, especially body fat ratio. At first cycles are anovulatory and vary from 10-60 days or >. Then in adulthood range form 25-35 days. Length varies considerably. Cycle and regular ovulation are dependent on  The activity of gonadostat  Initial pituitary secretion of gonadotropin FSH  Estrogen positive feedback for the preovulatory FSH and LH surge, oocyte maturation, and corpus luteum formation and production of progesterone. The average menstrual cycle lasts 27 to 30 days and consists of three phases, which are named for ovarian and endometrial changes: the follicular/proliferative phase, the luteal/secretory phase, and the ischemic/menstrual phase. Phase 1-is the follicular phase in which begins on day one of one’s menstrual cycle. It lasts until about day 14. -In phase 1 the endometrium grows to form a lush lining inside of the uterus. Phase 2: Luteal phase-this is where the body secretes the hormones estrogen and progesterone. -These hormones work together to prepare the lining of the uterus for implantation. -This last for 12 days. Phase 3: Menstrual phase-The estrogen and progesterone start to decline and the endometrial lining begins to shed. This lasts for 3-5 days and the process restarts. Ovulation -Release of ovum -Present at the beginning of the luteal/secretory phase. -The ovarian follicle begins to transform into the corpus luteum. -Pulsatile secretion of the LH from the anterior pituitary stimulates the corpus luteum to secrete progesterone. -This will initiate the secretory phase of endometrial development. -Glands and blood vessels in the endometrium branch and curl through a functional layer, and the glands begin to secrete a thin glycogen-containing fluid= the secretory phase. *If conception occurs the nutrient-laden endometrium is ready for implantation. *The HCG hormone is secreted 3 days after fertilization by blastocytes and maintains the corpus luteum once implantation occurs at day 6 or 7. *HCG can be detected in maternal blood or urine about 8-10 days after ovulation. *Production of estrogen and progesterone continue until placenta can adequately maintain hormonal production. *Ovulatory cycles have a length of 24-26.5 days. *The primary ovarian follicle requires 10-12.5 days to develop. *The luteal phase appears at 14 days. Ovarian events of the menstrual cycle are controlled by gonadotropins. High FSH levels stimulate follicle and ovum maturation (follicular phase), then a surge of LH causes ovulation, which is followed by development of the corpus luteum (luteal phase). Ovarian hormones control the uterine (endometrial) events of the menstrual cycle. During the follicular/proliferative phase of the ovarian cycle, estrogen produced by the follicle causes the endometrium to proliferate (proliferative phase) and induces the LH surge and progesterone production in the granulosa layer. During the luteal/secretory phase, estrogen maintains the thickened endometrium, and progesterone causes it to develop blood vessels and secretory glands (secretory phase). As the corpus luteum degenerates, production of both hormones drops sharply, and the “starved” endometrium degenerates and sloughs off, causing menstruation, the ischemic/menstrual phase. Cyclic changes in hormone levels also cause thinning and thickening of the vaginal epithelium, thinning and thickening of cervical secretions, and changes in basal body temperature. Uterine Prolapse descent of cervix or entire uterus into vaginal canal. In severe cases the uterus falls completely through the vagina and protrudes from the introitus. Symptoms of other pelvic floor disorders may also be present. Tx depends on severity of symptoms and physical condition of woman. First line treatment is often a pessary- removable mechanical device that holds uterus in position. The pelvic fascia may be strengthened through kegels or by estrogen therapy in menopausal women. Healthy BMI, preventing constipation, and treating chronic cough may also help. Surgical repair with or without hysterectomy is the last resort. Page-771 fig 25.11 -Dropping of the cervix or the entire uterus into the vaginal canal.