OB: Test One Flashcards
The rounded, uppermost portion of the uterus that extends above the points of attachment of the Fallopian tubes =
Fundus
Where is the site for implantation?
Endometrial lining
What do we measure during pregnancy to see where the baby is?
Fundal height
At what week is the fundus located at the umbilicus?
20 weeks
What is the funnel-like enlargement with many finger-like projections reaching out to the ovary (which try to pick up the eggs)?
fimbria (the projections that pick up the eggs are the fimbriae).
What part to we palpate to get contractions?
the fundus.
What is the innermost layer of the uterine corpus called?
The endometrium.
From menarche to menopause, the _____ undergoes monthly renewal and degeneration in the absence of pregnancy.
endometrium
The distal end of the uterus that opens up to connect with the vagina =
cervix.
What are the two hormones the ovaries are responsible for?
Estrogen and progesterone.
The bone that protects organs behind it formed from two pubic bones =
symphysis pubis
We want implantation high up in the endometrial lining because if it happens low, this condition can occur =
Placenta previa (the placenta is improperly implanted in the lower uterine segment which causes the placenta to be torn from the uterine wall=bleeding).
What do you do if a woman is in labor and she feels like she has to poop and asks you to go to the restroom?
Have to be careful because that is what it can feel like right before the baby comes out.
Where is GnRH (Gonadotropin-releasing hormone) secreted from?
hypothalamus
What does GnRH do?
tells the anterior pituitary to secrete FSH and LH
How long does the average menstrual cycle last?
28 days +/- 7 days
Hormone primarily responsible for the maturation of the ovarian follicle to mature into a Graafian follicle =
FSH
As the Graafian follicle matures, the more ___ is produced
estrogen
When estrogen levels are high ___, ____ levels are low.
FSH
Once estrogen gets to a certain level, there is a surge of ____secreted by the anterior pituitary.
LH
Where is the site where the ruptured follicle pops out of the ovary midway through the menstrual cycle?
corpus luteum
When does estrogen peak?
just before ovulation
What are some basic functions of estrogen?
- Contractility in uterus/fallopian tubes
- Tissue building: breast tissue, uterus, skin tone & reproductive tone, body hair, widening of hips
- Inhibit FSH production & stimulate LH production
- secreted by Graafian follicle
- in synergy with FSH, promote growth/development of primary follicle
- produces physical characteristics of mature follicle
- helps prepare endometrium for implantation through proliferation
Estrogens inhibit ___ production and stimulate ___ production.
FSH; LH
Go over hormone levels of reproductive cycle…
p 206
Ovulation occurs ____ after LH surge
10-12 hours
FSH and LH are secreted from the ____
ant. pituitary
What hormone completes maturation of the ovarian follicle?
LH
What hormone is responsible for the increase in secretion of progesterone?
LH
Which hormone is responsible for the maturation of the Graafian follicle which secretes increasing amount of estrogen?
FSH
What hormone prepares the uterus for pregnancy by promoting secretory endometrial cells?
Progesterone
Where is progesterone secreted from?
corpus luteum
What is the “hormone of pregnancy” and why?
Progesterone; inhibits uterine contraction to prevent abortion of embryo; also allows vaginal epithelium to proliferate and thus the cervix secretes thick, viscous mucus
What happens when the corpus luteum degenerates?
it drops estrogen and progesterone, and causes ischemia of the vessels=bleeding=menstrual period starts over again
When does ovulation occur?
14 days before she starts her period (day 14 of 28 day cycle, day 16 of 30, etc.)
Explain the 3 phases of the ovarian cycle:
1) Follicular Phase (days 1-14): Low level of estrogen signal hypothalamus to secrete GnRH, which stimulates ant. pit. to produce FSH; FSH stimulates follicle to mature; one follicle becomes dominant (graafian follicle); Cells surrounding follicle secrete estrogen; endometrium becomes thick; Anterior pituitary release surge of Lifehouse to complete maturation of follicle
2) Ovulation: Graafian follicle ruptures out of ovary about 12-24 hours after LH surge
3) Luteal Phase: day 14-28: Ovum leaves follicle; development of corpus luteum where the ovum ruptured; With pregnancy, the CL increases in size and produces progesterone; prog. causes endometrium to mature for possible implantation; If pregnancy occurs, hCG (from embryo) will maintain the CL.
Signs of ovulation:
Mittelschmerz (cramp that occurs when ovulation occurs); Midcycle spotting; Increase in body temp (.5-1 degree) under influence of progesterone; change in vaginal (cervical discharge)–becomes “favorable”=lots of it, thin/clear, sperm easily attach
Describe 4 phases of endometrial cycle:
1) Menstrual Phase: day 1-6: endometrium sloughs off uterine wall
2) Proliferative Phase: day 6-14: at end of menstruation, endometrium is thin/ischemic; within 2nd week, estrogen increases and endometrium thickens; cells undergo proliferative growth; predominant hormone is estrogen
3) Secretory Phase: Begins day 14: under influence of estrogen and progesterone, the endometrial glands grow; blood supply increases–allows for nutritive layer if conception occurs; Progesterone is predominant hormone
4) Ischemic Phase: If fertilization doesn’t occur, function of corpus luteum wanes and estrogen/progesterone levels drop; lining of endometrium becomes ischemic/cells degenerate causing rupture and endometrium sloughs off uterine wall.
What is the dominant hormone in the proliferative phase of the endometrial cycle?
Estrogen
What is the dominant hormone in the secretory phase of the endometrial cycle?
progesterone
What is the dominant hormone in the first half of the endometrial cycle?
estrogen
What is the dominant hormone in the second half of the endometrial cycle?
progesterone
When is sex determined for a baby?
at conception (but we can’t tell physically for a while)
How many pairs of chromosomes do we have?
23 (22 autosomes and one pair of sex chromosomes–XX in females, XY in males)
Process of cell division that results in daughter cells that are exact copies of the original cell =
Mitosis
5 Stages of Mitosis =
1) Interphase 2) Prophase 3) Metaphase 4) Anaphase 5) Telophase
What is the phase in Mitosis and Meiosis when DNA will double?
Interphase
Process of cell division that occurs in maturation process of ova and sperm (aka gametogenesis) =
Meiosis
This process decreases number of chromosomes from diploid (46) to haploid (23) =
Meiosis
This process allows random assortment of maternal and paternal chromosomes =
Meiosis
Oogenesis is a ____ division.
noncontinuous (begins in ovary during fetal life then stops until it re-begins in puberty).
The cell division process that results in 2 identical cells, each with the same # of chromosomes as the original cell =
Mitosis