What happens on day 1 of the gestation period?
pituitary gland releases FSH, ovary creates egg and follicle growth begins
What happens during days 2-7 of the gestation period?
follicle grows and produces estrogen which stimulates the lining of the uterus to produce new blood vessels
What happens during days 7-12 of the gestation period?
follicle grows to maturity (graafian follicle 18-24 mm)
What happens on day 14 of the gestation period?
estrogen peaks which causes pituitary gland to release LH which then causes graffian follicle to rupture & release ovum
What is the rate of growth of the primary ovum between days 1-14 of the gestation period?
What happens on day 14-15 of the gestation period?
the released graafian follicle is transformed into a corpus luteum cyst which produces progesterone, the progesterone prepares the uterus for implantation of a fertilized egg
How can a woman determine that she is ovulating?
body temp at highest level (1/2%-1% higher than normal)
What can be given vaginally to a woman to support implantation if progesterone is low?
What happens if no fertilization occurs by day 21 of the gestation period?
estrogen & progesterone levels drop, endometrium outrgrows the blood supply and begins to slough off
In which part of the fallopian tube is it most common for fertilization of the ovum to take place?
ampulla (distal third of the tube)
What two hormones does the corpus luteum continue to secrete after implantation?
estrogen & progesterone
What occurs on days 28-33 of the gestation period?
the gestational sac develops with the chorionic villi and attaches to the urerine wall to form placenta, inner cell mass forms as the embryonic disk and primary yolk sac
By day 35 of the gestation period (5 weeks mestrual age) what can be seen within the uterus?
double sac sign or psuedosac
Why is the measurement of the gestation sac not accurate for gestation age?
can be off by 2 weeks dependent on measurements & irregularity of sac
At week 6 gestation what has formed within the embryo?
forbrain/midbrain/hindbrain from brain, spine and cord/secondary yolk and sac/heart rate from neurotube
What should be seen on ultrasound for a 6 week old fetus (especially with transvaginal exam)?
At what age has the fetal organs and systems developed and have been correctly positioned?
10 weeks gestation
What cellular and aembryonic architecture occur at 10 weeks gestation?
neurocranial axia, cardiovascular system, gastrointestinal system, urogenital system, primitive skeleton, muscles, cord herination, kidney tissue
What abdominal wall defect can result from fetal bowel protruding from the abdominal wall through the cord site after 13 weeks gestation?
What type of twins originated from 2 eggs, 2 sperm, and develop in 2 seperate sacs and share 1 placenta?
What type of twins originated from 2 eggs, 2 sperm, and develop in 2 seperate sacs, each with their own placenta?
What type of twins originate from 1 egg, 1 sperm, and develop within the same sac, and share 1 placenta?
What type of twins originate from 1 egg, 1 sperm, and develop in seperate sacs, and share 1 placenta?
What would indicate that a transvaginal ultrasound should be performed within the first trimester?
vaginal bleeding, pain, abdomen measures large or small for dates, dates are unknown, drug abuse, IUD, trauma, history of twins or miscarriage
Why may there be vaginal bleeding in the first trimester?
ectopic pregnancy, miscarriage, hydatiform mole, choriocaricnoma
Why would a woman measure larger than usual during her pregnancy?
if there is a mass, mulitiple fetus, incorrect dates
Why would a woman measure smaller than usual during her pregnancy?
fetal demise, ectopic pregnancy, incorrect dates
Why do correct dates need to be determined during pregnancy?
so test dates can be determined, if cesarian section is needed, EDC
Why is it important to know if a woman has abused drugs during her pregnacy?
it can cause fetal anomalies, growth rate changes