Placenta
Intervillous spaces without chorionic villi.
Placental or Venous Lakes
Normal resistance of the placenta.
Low resistance
The zygosity of the most common type of twins overall.
Dizygotic
This protects and supports the umbilical vessels in the cord.
Wharton's jelly
The vessel(s) carry deoxygenated blood to the placenta.
Umbilical artery(ies)
Term used to describe a placenta that is within 2 cm of the internal os.
Low-lying
Normal direction of flow for the ductus venosus.
Antegrade, towards the fetal heart.
Most common type of monozygotic twin.
Monochorionic/Diamniotic
Term to describe the umbilical cord insertion 1 cm or less from the margin of the placenta.
Marginal or Battledore
Area in the placenta where nutrient and gas exchange occurs.
Intervillous spaces
Area in the placenta where nutrient, gas, and waste exchange occurs between the fetus and the mother.
Intervillous space
Handicap: 10-second delay for one team.
Normal resistance of the MCA in a fetus.
High resistance
If twins are different genders, they must be this chorionicity and amnionicity.
Dichorionic/Diamniotic
Term used to describe the umbilical cord insertion into the membranes and not the placenta.
Velamentous or Membranous
This vessel offers an alternate route for fetal blood to bypass the lungs.
ductus arteriosus
Term used when there are two placentas, similar in size, and are connected by chorionic tissue.
bilobate or bilobe
Umbilical Doppler waveform that is the MOST concerning.
reversed end diastolic flow
The T-sign is associated with this type of chorionicity and amnionicity.
Monochorionic/Diamniotic
Term used to describe when the umbilical vessels cross the internal cervical os.
This valve is evaluated in the RVOT view.
Pulmonary valve
Handicap: One team sits out for one round
Placenta grade when basal and interlobar septal calcifications are seen.
Grade 3
Term used to describe when the MCA resistance decreases due to hypoxia and blood flow to the brain increases.
Brain sparing
Term used to describe an intrauterine and ectopic pregnancy occurring simultaneously.
Heterotopic
Advantage: Phone a teammate
Cord cysts are most commonly seen where along the cord.
Closest to the fetus.
The three bypasses in fetal circulation.
Ductus venosus, foramen ovale, ductus arteriosus