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embryonic development
includes specialation of the primary germ layers and development of a circulatory system
week 5
nervous system develops, muscles form, cartilage model of skeleton begins
week 6
arm and leg buds appear, heart begins beating
week 7
heart divides R and L chambers
• Bronchi are present
• Intestines developing, pancreas is present
week 8
Eyelids forming, ears forming, valves form in the
heart
week 9
fingers and toes, recognizable as
human
week 10
all organs are present and functioning at some
level
– liver begins to form blood cells
– fully functional cardiovascular system
– hardening of bone is beginning
week 14
skin dermis and epidermis obvious, hair
appears
– crude facial features present
– sex readily detected from genitals
week 15
thumb sucking
week 16-20
“quickening”, baby
is strong enough and big enough that mom
can now feel movements
week 18
blinking of eyes and sucking motion with lips occur
– kidneys attain typical structure
– digestive tract glands have developed
week 21
swallows amniotic fluid
week 32
eyes open
– period of substantial increase in weight
– bone marrow becomes sole site of blood cell formation