Fetal Development Flashcards
1
Q
1) Week 1
2) Week 2-3
3) week 5
A
1) Blastocyst free-floating
2) Embryo 1.5-2 mm length/ blood circulation starts/heart starts to beat/neural plate becomes brain and spinal cord
3) Embryo 0.4-0.5cm/0.4g/heart chambers visible/heart beat/limb buds form
2
Q
Week 8
A
Embryo 3cm/2g
Eyelids start to fuse
Circulatory system established through umbilical cord
Every organ system present
3
Q
Week 12
A
Fetus 6-9 cm/ 19g Faced formed Limbs long/slender Kidneys start to form urine Spontaneous movement Heart beat detected via Doppler transducer 10-12wks Gender visible
4
Q
Week 16
A
Fetus 11.5-13.5cm/100g Active movement present Skin transparent Lanugo develops Skeletal ossification occurs
5
Q
Week 20
A
Fetus 16-18.5 cm/ 300g Lanugo covers body Nails Muscles developed Enamel/dentin depositing Heart beat detected with fetoscope
6
Q
Week 24
A
Fetus 23cm/600g Hair on head formed Skin reddish/wrinkled Reflex hand grasp functions Vernix caseosa covers body Can hear
7
Q
Week 28
A
Fetus 27cm/1100g Limbs flexed Brain development rapid Eyelids open/close Lungs developed to provide has exchange (lecithin forming) If born can breath at this time
8
Q
Week 32
A
Fetus 31cm/1800-2100g
Bones fully developed
Subcutaneous fat collected
Lecithin-sphingomyelin ratio 2:1
9
Q
Week 36
A
Fetus 35cm/2200-2900g Skin pink/body rounded Skin les wrinkled Lanugo disappearing Lecithin - sphingomyelin ration greater than 2:1
10
Q
Week 40
A
Fetus 40cm/>3200g Skin pink/smooth Lanugo present on upper arms and shoulders Vernix caseosa decreases Fingernails extended beyond fingertips Sole (plantar) creases run down to the heel Testes in scrotum Labia majora developed
11
Q
1) preembryonic period
2) embryonic period
3) fetal period
A
1) first 2 wks after conception
2) starts day 15 - 8 wk of conception
3) week 9 after conception to birth
