Menstrual Disorders Flashcards
What is the role of LH in females? What cell type does it act on?
Promote production of oestrogen from the ovaries by acting on theca cells
What is the role of FSH in females? What cell type does it act on?
Promote the growth of ovarian follicles by acting on granulosa cells
Within each ovarian cycle, what happens to a developing follicle?
It matures, releases an oocyte and differentiates into the corpus luteum
In the follicular phase of the menstrual cycle, what hormone stimulates follicular development and granulosa cells to produce oestrogen?
FSH
In the follicular phase of the menstrual cycle, raising levels of which hormones by the dominant follicle inhibits FSH production?
Oestrogen and inhibin
At the end of the follicular phase of the menstrual cycle, the declining levels of FSH have what effect?
Atresia of all follicles except the dominant one
The rising levels of oestrogen peak between days 12 and 14 which triggers a surge of which hormone?
LH
What happens to the dominant follicle in response to the LH surge at ovulation?
It ruptures and releases an oocyte
What happens to the dominant follicle in the luteal phase of the menstrual cycle?
It becomes the corpus luteum
In the luteal phase of the menstrual cycle, granulosa cells in the corpus luteum produce what hormone?
Progesterone
What is the role of progesterone in the luteal phase of the menstrual cycle?
Inhibit the release of FSH to prevent further follicle development
If pregnancy does not occur, what happens to the corpus luteum and levels of oestrogen and progesterone?
The corpus luteum degenerates and oestrogen and progesterone levels drop
What effect does progesterone have on the uterine endometrium?
Matures the endometrium
What effect does oestrogen have on the uterine endometrium?
Stimulates endometrial growth
What endometrial stage corresponds to each of the following ovarian cycle stages a) follicular? b) ovulation? c) luteal?
a) Menstrual phase b) proliferative phase c) secretory phase
What days of the menstrual cycle correspond to a) the menstrual phase? b) the proliferative phase? c) the secretory phase?
a) Days 1-5 b) days 5-14 c) days 15-28
What hormone is responsible for the proliferative phase of the endometrial cycle? What happens?
Oestrogen - growth of endometrial glands and stroma
What happens to the cervical mucus during the proliferative phase of the endometrial cycle?
It becomes thin and sticky, making it more penetrable to sperm
What hormone is responsible for the secretory phase of the endometrial cycle? What happens?
Progesterone - there is glandular secretory activity and decidualisation in the later stages
The decrease in both oestrogen and progesterone at the end of the preceding cycle has what effect on the endometrium?
Cells in the functional endometrium die and this is shed (menstruation)
What is a normal amount of blood to lose during menstruation?
< 80mls
Are clots and flooding normal during menstruation?
No
What range is considered a normal length of menstrual cycle?
21-35 days
During the menstrual cycle, when would it be abnormal to have vaginal bleeding?
Inter-menstrually (i.e. between periods) or post-coital
What is the difference between amenorrhoea and oligomenorrhoea?
Amenorrhoea is when there has been an absence of menstruation for > 6 months, oligomenorrhoea is when there is menses at intervals of > 35 days
What are some physiological causes for amenorrhoea?
Pregnancy, lactation, menopause, hysterectomy