Test 4 Flashcards
The umbilical chord is given support and prevented from folding and kinking by:
Wharton’s jelly
At 7 weeks gestational age the yolk sac is located in the:
Chorionic cavity
In what structure does the choroid plexus appear?
Lateral ventricle
Fetal gut imaged herniated into the umbilical cord is:
normal until the 12th week
Transfundal pressure is used to evaluate…
Incompetent cervix
Which scan plane is the best for assessing the presence of frontal bossing?
Sagittal scan plane of the face
What is the term used for eyes that are set too far apart?
Hypertelorism
Which structures do you need to see at the thalamic view?
Falx cerebri, fourth ventricle, and cavum septum pellucidum
The most accurate method to date a pregnancy is:
CRL between 7-9 weeks gestation
Ossification of the cranium begins around _____ weeks gestation
11
Measurement for cisterna magna:
3 - 8 mm
Measurement for lateral ventricles:
10 mm
Measurement for nuchal fold:
5 mm
Measurement for cervix:
> 3 cm
At what week gestation should the amnion and chorion be fused?
14-16 wks
The posterior ossification centers of the spine are widest at which area?
Cervical spine
When is organogenesis?
6 - 10 wks gestation
What is the most accurate method of measuring a cervical length?
Transvaginal
Where is the sample being taken from for a chorionic villus sampling?
Placenta
When blood is taken from the umbilical cord in a percutaneous umbilical blood sample, what section of the cord does the doctor insert the needle?
1 cm from the placental insertion
written
Amniocentesis are performed safely from ____ weeks to term.
15
How do you calculate probable due date from LMP?
??
You are working New Year’s Day and get an order for a 1st trimester ultrasound from the ER. The patient is unclear of her LMP because her cycles are irregular. You find an IUP with a fetal pole that measures 10 weeks. What was er conception date and what is her probable due date?
Conception: 11/6/23
Due date: 7/29/24
True/False:
The cord inserts into the fetal abdomen just superior to the stomach
False
True/False
The placental thickness is equal in centimeters to the number of weeks gestation
False
True/False:
A cervical cerclage suture may be applied to the cervix to treat an incompetent cervix until 32 weeks gestation.
False
True/False:
The fetal surface of the placental is termed the basal plate
False
Written
The gestational sac grows _____ a day in early gestation
1 mm
List two reasons for premature maturation of the placenta:
- Twins
- Smoking during pregnancy
written
Other than the length, describe two other things that you need to evaluate when imaging a fetal femur:
- echogenicity (needs to have the same brightness throughout with no patchy shadowing)
- Texture (should be a smooth surface, not rippled or rough)
