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The Endowment for Human Development
The Endowment for Human Development
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The Left Arm in Motion

#150, Slide 33 of 74

8 weeks

From The Biology of Prenatal Development.Buy Now

Note:

Exercise is almost always a good idea. Watch the movie to see this embryo's left arm in motion.

Label Key:

1. left shoulder
2. elbow
3. upper arm in motion
4. chest wall
5. nipple
All ages referenced to fertilization, not last menstrual period.
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