conception and fetal development

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created 3 weeks ago by Akosua_Ruby
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updated 3 weeks ago by Akosua_Ruby
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1

the embryonic stage occurs......

  • first 14 days after fertilization
  • rapid cellular multiplication
2

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
3

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
4

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
5

weeks 9-12

  • intestine enter abdomen by week 11
  • fetal movement can be felt with doppler
  • blood formation shifts from liver to spleen
  • urine production
6

what can be determined by the end of week 12?

gender

7

week 13-16

  • mother can feel fetus move if she's a multipara
  • growth in length
  • eyes and ears
8

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
9

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
10

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.
11

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
12

weeks 29-32

  • chances of survival with specialized neonatal care
  • fingers and toenails present
  • more subQ fat
13

what week is good for a high risk patient to reach before labor?

32 weeks

14

what matures by week 33-40?

  • pulmonary system matures
  • slower growth
  • vernix and lanugo disappear
  • male testes descend to scrotum
15

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

16

the umbilical cord contains......

the umbilical arteries(2) and vein (1) and transports blood between the fetus and placenta

17

Deoxygenated blood is carried in the........, oxygenated blood is carried in.....

arteries; veins

18

functions of the placenta

  • metabolism of nutrients for placental function
  • transfer: exchange of oxygen, nutrients and waster products across chorionic villi
  • endocrine
19

amniotic fluid functions

  • protection and promotion of normal fetal development
  • cushioning against impact
  • temperature regulation
20

amniotic fluid comes from.....

fetal urine and fluid transported across the amnion

21

Oligohydramnios is associated with

  • poor placental blood flow
  • premature rupture of membranes
  • failure of kidney development
  • poor fetal lung development
22

hydramnios or polyhydramnios is associated with

  • poorly controlled DM
  • malformation of CNS, cardiovascular system, GI tract
  • chromosomal abnormalities
  • multifetal gestation
23

functions as liver until birth

ductus venous

24

foramen ovale

flap between right and left atria shunting blood until fetus is born and can oxygenate own blood

25

connects pulmonary artery and descending aorta during fetal life

ductus arteriosus