Female Reproduction System Flashcards
What do the ovaries produce?
Female germ cells (oocytes and eggs).
Oestrogen and progesterone
What does the uterine tube do?
Captures the ovulate oocyte
What ligament supports the uterus and uterine tubes?
Broad ligament
What makes up the female urogenital triangle?
Vulva and external female genitalia
What innervates the urogenital triangle?
Pudendal nerve
What are oogonia?
Future eggs
What is oogenesis?
• Oogenesis – the maturation of oocytes
Which hormone is dominant pre-ovulation?
Oestrogen
Which hormone is dominant post-ovulation?
Progesterone
Where does the ovary develop from?
Mesonephros and gonadal ridge
What connects the ovary to the anterior abdominal wall?
Suspensory ligament of the ovary
What connect the ovary to the uterus?
Ovarian ligament
What is menarche?
The first occurrence of menstruation.
What makes up the outer layer of the oocyte?
Corona radiata
What makes up the inner layer of the oocyte?
The zona pellucida
What hormone do theca cells bind to?
LH
What do the antral follicles of the tertiary oocyte produce?
Steroid hormones
Which cells in the oocyte synthesise androgens?
Theca cells
Which cells of the oocyte convert androgens into oestrogen?
Granulosa cells
What controls GnRH secretion by the hypothalamus?
Oestrogen levels
What hormone do granulosa cells bind to?
FSH and LH
Where is gonadotrophin (peptide hormone) produced?
Anterior pituitary
What does gonadotrophin do?
Acts on the granulosa cells stimulating them to produce oestrogen.
What effect does oestrogen have on granulosa cells?
Stimulates the proliferation of granulosa cells.
What cells does LH bind to in the oocyte?
Theca cells
What cells do FSH bind to in the oocyte?
Granulosa cells
What effect does LH have on theca cells?
Stimulates theca cells to produce androgens
What part of the uterine tube catches the egg produced by the ovaries?
The fimbrial end
When is follicular development stopped in the fetus?
Prophase 1 of meiosis
What does the zona pellucida separate?
The zona pellucida separates the oocyte from granulosa cells.
What stimulates the proliferation of granulosa cells?
Oestrogen
How does a spike in oestrogen increase the chance of fertilisation between days 11-15 of then menstrual cycle?
Oestrogen makes the vaginal mucosa more hospitable to incoming sperm.
What arteries supply the endometrial layer of the uterus?
Spiral arteries
What cells differentiate into primary oocytes?
Primordial oocytes
What causes only one follicle to be produced in ovulation?
FSH secretion decreases, so there is only enough FSH to stimulate production of one follicle.
What determines which one follicle matures?
The follicle with the most FSH receptors becomes dominant as the others die off.
What is the graafian follicle?
The one mature follicle that develops
What cells form the corpus luteum?
Granulosa cells
What hormones does the corpus luteum secrete?
Oestrogen
Progesterone
INHIBIN
If fertilisation occurs when and where does the fertilised egg implant?
It implants into the uterine endometrium around the 5th day following fertilisation.
What structures maintain pregnancy?
Corpus luteum
Placenta
When does the placenta take over maintenance of pregnancy?
During the second and third months of pregnancy.
How does duration of the preovulatory phase vs the postovulatory phase vary?
The POSTovulatory phase is always 14 days.
The preovulatory phase is around 14 days but varies.
What hormone is the primary hormone that maintains pregnancy?
hCG
Where is hCG produced?
Syncytiotrophoblasts in the placenta
Also initially in the corpus luteum
How does a surge of oestrogen produced by the dominant follicle affect theca and granulosa cells?
Stimulates the growth of LH receptors
What is the round ligament of the uterus?
A remnant of the female gubernaculum.
In order what are the three layers of the uterus?
Endometrium - inner layer
Myometrium - middle layer
Perimetrium - outer layer
How does the endometrium change?
The endometrium proliferates in the first half of the menstrual cycle.
If fertilisation does not occur the endometrium degenerates and is sloughed off during days 3-5 of menstruation.
What do syncytiotrophoblasts in the placenta produce?
hCG
What is the myometrium of the uterus?
The smooth muscle layer
What is the perimetrium of the uterus?
A serous layer of visceral peritoneal covering
What cells line the lumen of the vagina?
Stratified squamous non-keratinized epithelium
What produces the mucus that lubricates the vagina?
Cervical glands
When does the proliferative phase of the menstrual cycle occur?
Days 5-14 of the menstrual cycle
What hormones stimulates the proliferative phase of the
Oestrogen
What are the two parts of the menstrual cycle?
Ovarian cycle
Uterine cycle
What are the two components of the ovarian cycle?
Follicle development
Ovulation
What comprises the first 5 days of the menstrual cycle?
Menstruation (bleeding)
Follicular development is also occurinig
Follicle growth results in increased oestrogen what is the feedback from this?
Negative feedback, high oestrogen causes the anterior pituitary to secrete less FSH.
What happens when the uterus goes through the proliferative phase?
- Functional endometrium thickens
- Uterine glands grow
- Spiral arteries form supplying the endometrial layer of the uterus
What does the LH surge do?
The LH surge causes rupture of the ovarian follicle, and release of the oocyte.
What does inhibin do?
Inhibits FSH secretion
How does progesterone affect FSH and LH levels?
Inhibits their secretion causing LH and FSH levels to fall.
How does progesterone affect the uterus?
Progesterone causes the uterus to begin it’s secretory phase.
What changes happen after day 15 when the window for fertilisation begins to close?
- The cervical mucus thickens becoming less hospitable to sperm.
- Corpus luteum is replaced by the corpus albicans which does produce any hormones. This causes oestrogen and progesterone levels to decrease.
How does oestrogen affect the cervical mucus and why?
Oestrogen makes the cervical mucus thin and watery, to aid the migration of sperm through the cervical os.
How does progesterone affect cervical mucus and why?
Progesterone makes the cervical mucus thicker, preventing bacteria from entering the uterus maintaining pregnancy.
How is menopause defined?
No menstruation for 12 months with no other cause.
What is the average age menopause occurs?
51
What are the symptoms of the menopause?
Vasomotor symptoms - hot flushes
Urogenital changes - vaginal dryness, vaginal arophy
Changes in mood
Osteoporosis
What is oxytocin secreted into the blood by?
Posterior pituitary
What is oxytocin produced by?
Hypothalamus
What does oxytocin do?
Oxytocin stimulates the uterine muscles to contract and also increases production of prostaglandins, which increase the contractions further.
Stimulates milk ejection from the nipple.