University:
Kentucky State University
Course:
BIO 301 | Human Anatomy
Academic year:

2023
Views:

69

Pages:

4
Author:

ilikemyicons0y5

The Uterine (Menstrual) Cycle • Cyclic changes in endometrium in response to fluctuating ovarian hormone levels • Three phases • Days 1–5 - menstrual phase • Days 6–14 - proliferative (preovulatory) phase • Days 15–28 - secretory (postovulatory) phase Endometrial glands Blood vessels Menstrual flow Functional layer Basal layer Days 1 5 Menstrual phase 10 Proliferative phase 15 25 20 Secretory phase The three phases of the uterine cycle: • Menstrual • Proliferative • Secretory 28 Plasma hormone level Correlation of anterior pituitary and ovarian hormones with structural changes of the ovary and uterus. LH FSH Ovulation Corpus luteum Dominant follicle Degenerating corpus luteum Both the menstrual and proliferative phases occur before ovulation, and together they correspond to the follicular phase of the ovarian cycle. Plasma hormone level Follicular phase Ovulation (Day 14) Luteal phase The secretory phase corresponds in time to the luteal phase of the ovarian cycle. Estrogens Progesterone Endometrial glands Blood vessels Menstrual flow Functional layer Basal layer Days 1 5 Menstrual phase 10 Proliferative phase 15 20 Secretory phase 25 28 Uterine Cycle Menstrual flow Functional layer Basal layer Days 1 5 Menstrual phase 10 Proliferative phase 15 25 20 Secretory phase • Menstrual phase (Days 1 - 5) • Ovarian hormones at lowest levels • Stratum functionalis shed; menstrual flow (blood and tissue) 3 - 5 days • By day 5 growing ovarian follicles produce more estrogen 28