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Flashcards in Stages of development Deck (57)
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1
Q

how long is preembryonic stage

A

from fertilization to 2 weeks

2
Q

when is the first critical period

A

in the preembryonic stage. “all or no effect”

3
Q

what processes occur in the preembryonic stage

A

mitosis, entry of zygote into uterus, implantation, germ layer development and embryonic membranes development

4
Q

how long is the embryonic stage

A

starts on first day of week 3 (day 15) and lasts until the end of week 8

5
Q

what processes occur in the embryonic stage

A

differentiation of cells, organogenesis, and weekly developments begin

6
Q

when is the second critical period

A

in the embryonic stage (weeks 3-8). teratogens can cause congenital defects

7
Q

what are the developments that occur in the 2nd month?

A

eyes, ears, nose, jaw, neck form. tiny buds become arms, legs, fingers, toes. intestines grow. heart develops separate chambers. liver and spleen produce blood cells.

8
Q

what month does movement begin

A

2nd month

9
Q

how big is embryo in 2nd month

A

1/2 inch long

10
Q

what happens to embryo in 2nd week

A

cells that form part of fetal membranes and placenta develop

11
Q

what happens to embryo in 3rd week

A

CNS begins to develop

12
Q

what happens to embryo at weeks 4-5

A

brain develops rapidly, heart beats in week5

13
Q

what happens to embryo in 6th week

A

head is prominent, facial development begins

14
Q

what happens to embryo in 7th week

A

general growth and refinement of all systems

15
Q

what happens to embryo in 8th week? how long?

A

definite human form, refinement of systems continue, becomes “fetus”.
over 1/2 inch in size. eyelids and ears are forming, tip of nose forming. arms and legs well formed. fingers and toes longer and more distinct

16
Q

when are all major systems basically present?

a. fetal stage
b. embryonic stage
c. preembryonic stage

A

a

17
Q

when do lungs begin to expand and contract

A

9-12 wks

18
Q

when does the brain begin to signal body movement

A

9-12 wks

19
Q

when are external genitals well formed

A

9-12 wks

20
Q

when are fingers and tooth buds present

A

9-12 wks

21
Q

when are RBCs produced by liver

A

9-12 wks

22
Q

when is fetus 2 inches

A

12 weeks

23
Q

when does fetus start to make its own movements

A

12 wks

24
Q

when can the uterus start to be palpated above pubic bone

A

12 wks

25
Q

when can the doctor hear baby heartbeat with special instruments

A

12 wks

26
Q

when do sex organs start to become clear

A

12 wks

27
Q

when does quickening begin

A

13-16 wks

28
Q

when is the rapid growth in length period

A

13-16 wks

29
Q

when does the fetus measure 4.3-4.6 inches

A

16 wks

30
Q

when does the fetus weigh about 3.5 oz

A

16 wks

31
Q

when can you feel the top of the uterus about 3 inches below belly button

A

16 wks

32
Q

when can baby blink

A

16 wks

33
Q

when are heart and blood vessels fully formed

A

16 wks

34
Q

when does fetus develop fingerprints and toeprints

A

16 wks

35
Q

when does heat retaining brown fat develop

A

20 wks

36
Q

when is vernix developing

A

20 wks

37
Q

when does fetus get lanugo

A

20 wks

38
Q

what does fetus weigh and how long at 20 wks

A

10 oz, little more than 6 inch long

39
Q

where is uterus at 20 wks

A

at level of belly button

40
Q

what actions can baby do at 20 wks

A

suck thumb, yawn, stretch, make faces

41
Q

t/f quickening is occuring at 20 wks

A

true

42
Q

what forms at 24 wks

A

alveoli in lungs

43
Q

when does vernix cover the baby

A

24 wks

44
Q

how much does baby weigh at 24 wks

A

1.4 lbs

45
Q

how does baby respond to sounds at 24 wks

A

weaving or increasing its pulse

46
Q

what may be noticed at 24 wks if baby has this?

A

may notice jerking if has hiccups

47
Q

when can baby sense that its upside down

A

24 wks. with inner ear fully developed at 24 wks, may sense that its upside down in the womb

48
Q

when are lungs mature enough to provide gas exchange

A

25-28 wks

49
Q

how much does baby weigh at 28 wks

A

2 lbs 6 oz

50
Q

when does baby start to make position changes often

A

28 wks

51
Q

when is CNS able to direct breathing movement

A

29-32 wks

52
Q

when are bones fully developed

A

29-32 wks

53
Q

when is the baby gaining weight

A

33-36 wks

54
Q

how long and weight of fetus at 36 wks

A

18.5 inches and close to 6 lbs

55
Q

when is the brain developing rapidly with the lungs nearly fully developed

A

33-36 wks

56
Q

when is the head usually positioned down into the pelvis by

A

33-36 wks

57
Q

when is the brain fully developed

A

38-40 wks