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NUR 359: OB > Fetal Development > Flashcards

Flashcards in Fetal Development Deck (75):
1

fertilization=

conception

2

def zygote

sperm fuses w/ an ovum to form a new diploid cell

3

after the union of the 2 gametes, the zygote will contain how many chromosomes

46

4

when is the sex of the baby determined

@ the moment of fertilization

5

cell division occurs via

rapid mitosis

6

when does a blastocyst form?

3 days after fertilization

7

patho of blastocyst

- blastocyst implants into the endometrium and sarronds itself in maternal tissue
- inner cell mass of blastocyst develops into embryo

8

when does implantation occur?

7-10 days after fertilization
-approx day 22/23rd day of 28 day cycle

9

implantation causes which hormone to be secreted

HCG

10

is there a (+) preg test when implantation occurs

no- not yet

11

which bodily fluid picks up HCG fastest

blood

12

when will a mom get a (+) preg test

4 weeks

13

the first day of LMP is used to determine

due date
gest age

14

when is the embryonic period

3-8 wk of preg after conception

15

what development occurs during the embryonic period

-basic structures of all major organs completed
-tissues differentiate into essential organs

16

when is a baby most vulnerable to teratogens

embryonic period

17

a baby is considered a fetus after the ____ wk

8th

18

when is the CNS and heart developing/developed

3rd wk

19

when is external genitalia developed

8-9 wk

20

when does the brain begin to develop

wk 9-16

21

how often does HCG rise during preg?

q 24 h

22

def implantation bleeding

bleeding occurs when egg burrows into the endometrial wall

23

implanation bleeding is AKA

implantation spotting

24

what color is blood when implantation bleeding occurs

light red/pink

25

the flickering of a heart can be heard when and through what method

end of wk 6
US

26

length of fetal period

9 wks to birth

27

at 8 wks, you can hear the fetal heart beat via

vaginal US

28

when is the best time to date a preg

8 wks

29

what measurement is taken at 8 weeks

crown-rump measurement

30

fetal heartbeat can be detected by ____ @ 12 wks

doppler

31

external genitalia can be distinguished

8-12 wks

32

when does lanugo begin to develop

8-12 wks

33

when can the sex of the baby be determined

17-21 wks

34

quickening can be perceived by mom as early as

16 wks

35

quickening must be perceived by which week

20th week

36

vernix caseosa covers skin during which weeks

16-20 wks

37

brown fat production is completed by

20 wks

38

purpose of brown fat

- keeps baby warm in utero
- helps provide nourishment for newborn while mothers milk is still descending/producing

39

if the fetus were born during this week, it would be possible for it to survive

24 wks

40

what is happening at 24 wks gestation

-lung alveoli beginning to form
- surfactant production begins in lungs
-gas exchange possible
-fetal resp mvmts

41

fetal resp mvmts

can see chest of fetus move up and down on US
expanding and contracting
baby is practicing breathing

42

the baby has a much better chance of survival of born during which week

28th week

43

eyes open and close after how many wks gestation

26 wks

44

gestational development at 32 weeks

-rhythmic breathing mvmts
-ability to control temp

45

gestational dev at 38 wks

-well developed ability to exchange gas
-lanugo on back and shoulders only
- vernix present in major body creases

46

auxiliary structures/organs

placenta
umbilical cord
fetal membranes- amniotic sac
amniotic fluid

47

T/F- the placenta is the interface bx mother and fetus

true

48

metabolic fx of the placenta

- substances synthesized into
glycogen
chol
carbs
fatty acid

49

what is the key fx of the placenta

respiration/gas exchange by simple diffusion

50

placenta as the transfer organ

o2
nutrients
waste products
AB's

51

T/F- placenta stores nutrients

true

52

when does HCG become present in blood

8-10 days after fertilization

53

when does HCG become present in urine

at time of missed menses

54

fx of progesterone during preg

- causes endometrium to change into the decidua
- decreases contractility of the uterus
-suppresses maternal rxns to fetal antigens that cause SAB

55

def decidua

provides nourishment for the early conceptus

56

what hormone must be present for implantation to occur

progesterone

57

what hormone can be given to prospective moms if they are having trouble getting/ staying pregnant

progesterone

58

fx of estrogen during preg

- enlargement of breasts, uterus, and external genitalia
-enhances uterine activity as due date approaches

59

what is HPL

human placental lactogen

60

fx's of HPL

- promotes nutrition and fetal growth
-decr maternal insulin sensitivity and utilization of glucose---> making more glucose available for fetal growth
-maternal breast development to support lactation

61

bv's of the umbilical cord

2 arteries
1 vein

62

what is wharton's jelly

sarrounds the bv's in the umbilical cord

63

when does the amniotic sac form?

at time of implantation

64

layers of the amniotic sac

- amnion
-chorion

65

amnion

- inner membrane of amniotic sac
-contains amniotic fluid

66

chorion

-outer membrane of the amniotic sac

67

what is chorio

infec of the chorionic membrane

68

what are mom and baby at risk for if the chorionic sac membrane is ruptured

infec

69

amniotic fluid____ in vol throughout the preg

increases

70

what is the normal vol range of amniotic fluid after 20 wks gestation

700-1000 mL

71

fx of amniotic fluid

-thermoreg of fluid
- symmetrical growth and dev of fetus
-cushions and protects fetus
- protects umbilical cord

72

what measurement is important to determine fetal well being

volume of amniotic fluid

73

oligohydramnios

leak of amniotic fluid

74

polyhydramnios

may indicate that the baby is not swallowing
----> may indicate baby GI distress/disfx

75

likelihood of having twins increases with

maternal age