Germ layers: ectoderm vs. mesoderm vs. endoderm
The nervous system and the epidermis develop from which germ layer?
Answer B: explanation for every choice
A
Mesoderm forms muscle, bone, connective tissue, blood, the heart, and kidneys.
B
Correct. Ectoderm gives rise to the nervous system, epidermis, hair, and nails.
C
Endoderm forms the lining of the gut and respiratory tract, plus the liver and pancreas.
D
The trophoblast forms part of the placenta, not the embryo's tissues.
TakeawayEctoderm: nervous system and skin. Mesoderm: muscle, bone, blood. Endoderm: gut and lung linings.
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Reviewed 2026-11-05 by a medical student. Spot an error? Report it with question ID bb84.