Fetal Development Flashcards
Period beginning 20 weeks AOG and ending up to 28 completed days after birth
Perinatal period
Period after birth of an infant up to 28 completed days after birth
Neonatal period
At 12 weeks, the average crown-rump length is:
6-7 cm
Gender can be determined by experienced observers by inspection of the external genitalia by:
14 weeks
The fetus is covered by vernix caseosa at around:
28 weeks
This plane corresponds to the greatest circumference of the head at 34.5 cm
Occipitofrontal
This plane corresponds to the smallest circumference of the head at 32 cm
Suboccipitobregmatic
A shunt that permits fetal blood to bypass the liver
Ductus venosus
In the foramen ovale, blood flows from the ___ to the ___
Right atrium to the left atrium
The ductus arteriosus shunts blood from the ___ into the ___
Pulmonary trunk into the aortic arch
The first site of hematopoiesis
Yolk sac
Starts hematopoiesis at 4 mos AOG and remains as the major site of blood formation during adulthood
Bone marrow
Fetal blood volume of term infants is approximately (mL/kg):
125 mL/kg
The foramen ovale is functionally closed within several minutes and becomes anatomically fused by ___ after birth
1 year
The ductus arteriosus is anatomically closed by 2-3 weeks but is already functionally closed by ___ after birth
10-12 hours
