conception and fetal development
the embryonic stage occurs......
- first 14 days after fertilization
- rapid cellular multiplication
what happens during the embryonic period? what develops?
- the zygote divides into 16 cells called the morula
- part of the outer membranes develop into chorion and amnion
what is completed during the embryonic stage? when does it happen?
- basic structures of all major body organs are completed
- day 15 through week 8
what is the longest part of prenatal development? when does it begin?end? what happens during this stage?
- fetal development
- begins 9 weeks after conception and ends with birth
- growth and refinement in structure and function of all organ systems
- intestine enter abdomen by week 11
- fetal movement can be felt with doppler
- blood formation shifts from liver to spleen
- urine production
what can be determined by the end of week 12?
- mother can feel fetus move if she's a multipara
- growth in length
- eyes and ears
quickening is felt during what week? what should be done if fetus is not felt by mother
- week 17-20
- assessment and intervention may be necessary if quickening is not felt
weeks 17-20 development
- lanugo covers fetal body
- vernix caseosa protects fetus from amniotic fluid
- eyebrows and head hair
- brown fat helps with temperature regulation
lungs begin surfactant production in.......can fetus survive in this period?
- weeks 21-24
- fetus can survive by end of period but complications and mortality rate are high. age of viability around 23wks.
blood formation move to the bone marrow by what week? what position is fetus in? what's the texture of the skin?
- weeks 25-28
- fetus assumes head down position
- smoother skin as subQ fat is deposited
- eyes reopen
- chances of survival with specialized neonatal care
- fingers and toenails present
- more subQ fat
what week is good for a high risk patient to reach before labor?
what matures by week 33-40?
- pulmonary system matures
- slower growth
- vernix and lanugo disappear
- male testes descend to scrotum
True or false: maternal and fetal blood mix within the intervillous spaces of the placenta.
false. maternal and fetal blood do not mix. exchange occurs within intervillous spaces of the placenta
the umbilical cord contains......
the umbilical arteries(2) and vein (1) and transports blood between the fetus and placenta
Deoxygenated blood is carried in the........, oxygenated blood is carried in.....
functions of the placenta
- metabolism of nutrients for placental function
- transfer: exchange of oxygen, nutrients and waster products across chorionic villi
amniotic fluid functions
- protection and promotion of normal fetal development
- cushioning against impact
- temperature regulation
amniotic fluid comes from.....
fetal urine and fluid transported across the amnion
Oligohydramnios is associated with
- poor placental blood flow
- premature rupture of membranes
- failure of kidney development
- poor fetal lung development
hydramnios or polyhydramnios is associated with
- poorly controlled DM
- malformation of CNS, cardiovascular system, GI tract
- chromosomal abnormalities
- multifetal gestation
functions as liver until birth
flap between right and left atria shunting blood until fetus is born and can oxygenate own blood
connects pulmonary artery and descending aorta during fetal life