From which embryonic germ layer does the central nervous system (brain and spinal cord) develop?
Answer and explanation
Correct answer: A. Ectoderm (specifically the neural ectoderm / neural tube)
The embryonic ectoderm gives rise to the neural tube (which forms the central nervous system: brain, spinal cord, motor neurons) and neural crest (peripheral nervous system, melanocytes, facial cartilage), as well as the surface epidermis. The mesoderm forms muscle, bone, connective tissue, and kidneys; the endoderm lines the gastrointestinal and respiratory tracts.
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