week 3 Flashcards
Pre Embryonic Stage
conceiving to 2nd week
Embryonic Stage
2nd week to 8th week
Fetal stage
8th week until birth
Week 3 Gestation
dvlp brain and spinal cord
heart and GI tract begin developing
leg and arm buds are present
Week 4 Gestation
Brain differentiates
limbs develop
stomach liver and pancreas begin
Week 5 gestation
HB has reg rhythm
eyes, ears and cranial nerves begin appearing
muscles become innervated
Week 6 gestation
formation of lungs
circulation; liver produces RBC
primative skeleton formed
brain waves detectable
Week 7 gestation
straightening of trunk
nipples, hair follicles form
elbows and toes visible; limbs begin moving
diaphragm formed
fetal HB
mouth with lips present
week 8 gestation
rotation of intestines
facial features
resembles a human
week 9-12 gestation
sexual differences
buds for teeth present
digestive syst with activity
face and neck formed
urine produced and excreted
sex is determined by wk 12
digits well formed
week 13-16 gestation
fetal skin is transparent
bones harden
sucking motion
amniotic fluid swallowed
nails present
week 17-20 gestation
heart tones heard with stethoscope
eyebrows and head hair
brown fat deposited
muscles well developed
week 21-24 gestation
palmar grasp and startle reflex
alveoli form
body lean and well proportioned
skin is red and translucent
lungs produce surfactant
week 25-28 gestation
15 inches in length
rapid brain development
eyelids open and close
NS controls some functions
fingerprints present
assumes head down position
Week 29-30 gestation
^in body fat
^ in CNS control
lungs not fully mature
fetus stores iron, ca and P