quiz 5 Flashcards
(20 cards)
Ectoderm
Outer Layer
Mesoderm
Middle Layer
Endoderm
Inner Layer
Fertilization occurs how many hours after ovulation and where?
about 24-36 hours after ovulation- in the ampullary region of the fallopian tube
Where does the blastocyst implant
he blastocyst begins to implant in the decidualized endometrium (toward uterine fundus/mid-uterus).
What does the placenta contain and what does it provide?
The placenta contains both maternal and fetal tissue. It provides oxygen and nutrients and removes waste products from the baby’s blood.
Mean Sac Diameter
Used to date early pregnancy
Yolk Sac (secondary)
Earliest intra gestational sac anatomy seen
Double Sac Sign
2 layers of decidua - capsularis & parietalis
CRL (Crown Rump Length)
Most accurate way to date a pregnancy by ultrasound
-Measure top of head to bottom of the rump, without legs
- Embryo grows 1 mm per day
M-Mode (Fetal Heart Rate- FHR)
GA is approx. 6 wks . Normal BPM is 100-110 at this GA.
Cephalic vs Breech
head down and Legs or butt down
Measure Amniotic Fluid - AFI
4 quadrants typically measured. AFI - amniotic fluid index.
BPD - Biparietal Diameter
Outer to Inner Measurement of the Parietal in fetus’s brain
HC - Head Circumference
Measure at the same level as BPD. Outer Circumference.
FL - Femur Length
Measure the long axis of the femoral shaft
AC - Abdominal Circumference
level of portal sinus of umbilical vein and stomach.
Measure outer circumference.
Face Profile
Nasal bone appears as a bright echo parallel to the echogenic skin interface in the superior aspect of the nose. ‘Equal Sign’
Fetal Heart Rate with M-mode
Ranges from 120 to 160 beats per minute (bpm) in 2/3rd trimester..
Spine
cervical, thoracic, lumbar, sacral
