fetal development

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13 Terms

1
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embryonic development

includes specialation of the primary germ layers and development of a circulatory system

2
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week 5

nervous system develops, muscles form, cartilage model of skeleton begins

3
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week 6

arm and leg buds appear, heart begins beating

4
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week 7

heart divides R and L chambers
• Bronchi are present
• Intestines developing, pancreas is present

5
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week 8

Eyelids forming, ears forming, valves form in the
heart

6
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week 9

fingers and toes, recognizable as
human

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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

8
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week 14

skin dermis and epidermis obvious, hair
appears
– crude facial features present
– sex readily detected from genitals

9
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week 15

thumb sucking

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week 16-20

“quickening”, baby
is strong enough and big enough that mom
can now feel movements

11
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week 18

blinking of eyes and sucking motion with lips occur
– kidneys attain typical structure
– digestive tract glands have developed

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week 21

swallows amniotic fluid

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week 32

eyes open
– period of substantial increase in weight
– bone marrow becomes sole site of blood cell formation