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35 Cards in this Set

  • Front
  • Back
Decidua Basalis
thickened decidual zone of reaction at the implantation site
Decidua Capsularis
Thin decidua that has grown to overly the implanted gestational sac
Decidua Parietalis
The remaining endometrium that was not at the site of implantation
"decidua vera"
embryonic tissue lining the outside of the gestational sac
Chorion Frondosum
Chorion facing the endometrium at the implantation site
Forms the chorionic villi
Chorionic Laeve
The thin chorion of the gestational sac facing the endometrial cavity
FSH increased
Produced from the anterior pituitary lobe
Day 1
Estrogen increased
produced by the ovaries
increases days 2-14
continues through day 21
Produced from the anterior pituitary lobe
Progesterone increased
Causes corpus luteum to form
days 14-21
Changing hormones alter the:
hormone levels
Changes in the uterus
Changes in the follicles
Fertilization occurs in the:
The fertilized ovum becomes the:
distal 1/3 of fallopian tube
zygote (two cells are one, then divide by 2)
Cell division becomes the:
It is the:
cluster of cells 16-32
At about day 20, the morula becomes the:
Occurs between days 20-23:
It usually occurs at:
A level of the uterus that supports placentation
Syncytiotrophoblasts are:
Usually occurs during week:
the trophoblast cells of the blastocyt that contact the uterine endometrium
Week 4
Placentation is when:
development of the uteroplacental circulation occurs
During week 4, and inncer cell mass becomes an:
This seperates the:
embryonic disc
embryonic cavity from the primary yolk sac
The double sac sign is:
two echogenic incomplete coecentric rings seperated by a hypoechoic zone
Layers of the double sac sign:
Inner ring (decidua capilaris and choriion laeve)
Outter ring (decidua pariettalis)
Darker zone: endometrial cavity and fluid
Visible at 6 weeks:
When can you tell the head from the rump?
7-9 weeks
First trimester pregnancy measurements:
GS, YS, CRL, biperietal diameter, femur length, abdominal circumference
Average Sac Diameter is measured: (when)
Used to:
Before the embryo is visible
Date the gestation and determine amnionic fluid volume
How to measure the ASD
Measure the inside borders of the GS in 3 months, sum and divide by three
Yolk sac becomes visible:
Serves as a:
between weeks 5-6
locator of the fetal pole
5-6 diameter at this point
Crown rump length is the distance between:
Accurate w/in:
the arms extended upward and palms facing up
Accurate w/in 4 days of GA
Neuroplate timing:
Neurotube and neurocrest:
Brain segmentation timing:
menstrual week 4-5
Brain and spinal cord from the neurotube
At week 6
1) cerebrum, lateral ventricles, thalamus
2) aqueduct of Sylvius
3) pons, medulla, cerebellum, 4th ventricle
The fetal neurotube is formed by the:
It closes from the:
fetal spine and spinal cord
Middle toward both ends
The brain, or an anechoic fluid filled mass, develops in week:
The heart is the fusion of:
two parallel cardiac tubes, which eventually fold to make 4 chambers
Pregnancy is confirmed at the observation of:
Seen at:
the hearts tubular activity
5 weeks transvag
7 weeks transab
Lungs buds form week:
At the:
most proximal part of alimentary canal
Small bowel herniates into the umbilical cord:
10-11 weeks
2nd trimester
Bones can only be seen when this is present:
Begins at 8 weeks