Human Growth and Development / Unit 2 HGD 0184 short lesson, about 20 seconds
Organogenesis
Captions available
The idea
Organogenesis is the formation of organs; about three weeks after conception, the embryo differentiates into three cell layers that build the body.
In practice
Ectoderm to nervous system and skin; mesoderm to muscle, bone and blood vessels; endoderm to gut and lungs.
Where people slip
Because organs form here, harm during the embryonic period tends to affect structure most.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
Builds on
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