Lecture 4: Preparation for Pregnancy/Ovulation Flashcards
Describe the composition of cervical mucous during ovulation
Thinnest around this time
List the three stages of the ovarian cycle
Follicular phase, Ovulation, Luteal phase
List the three stages of the endometrial cycle and when each occurs
Menstrual phase (Day 1-4), Proliferation phase (Day 4-14), Secretory phase (Day 15-28)
When does the follicular phase occur and what are the major events?
Days 1-14 of menstrual cycle; development of mature Graafian follicle and secondary oocyte
Which of the following is primarily responsible for ovulation?
A. Rise in levels of FSH
B. Secretion of progesterone
C. Synthesis of testosterone
D. Sharp rise in levels of LH
D. Sharp rise in levels of LH
When does ovulation occur? What are the major events?
Day 14 of menstrual cycle; egg is released from Graafian follicle, thecal cells secrete progesterone
What is the significance of the luteal phase?
Corpus Luteum formed from theca and granulosa cells
What is the fate of the corpus luteum if fertilization does not occur?
Inhibin causes its regression; it’s replaced with scar tissue resulting in the formation of the corpus albicans
What occurs during the menstrual phase?
Endometrial build up sloughs off, resulting in menstrual flow
What is the significance of the spiral arteries during the menstrual phase?
Menstruation begins with vasoconstriction of spiral arteries supplying endometrium
What causes the vasoconstriction of spiral arteries?
Prostaglandins
What occurs during the proliferation phase?
Endometrial growth increases thickness, estradiol increased
What occurs during the secretory phase?
Estrogen levels decrease, endometrial growth stops. Mucous glands develop and begin secretion; rise in progesterone
What is the ovulated product?
Ovum at Metaphase II, 1st polar body, ZP, corona radiata, expanded cumulus oophorus
Fertilization age
Dates age of embryo from time of fertilization
