What is the embryonic origin of nervous tissue?

What is the embryonic origin of nervous tissue?

• A. Mesoderm
• B. Ectoderm
• C. Endoderm
• D. None of the above

Answer: (B)

Nervous tissue comes from the ectoderm. In early development, the outer germ layer differentiates into neural tissue through the formation of the neural plate, which folds to create the neural tube that becomes the brain and spinal cord. Neural crest cells, also derived from ectoderm, contribute to many components of the peripheral nervous system. By contrast, the mesoderm forms muscle, bone, and the cardiovascular system, while the endoderm lines the gut and associated organs. So the nervous system originates from the ectoderm.

Nervous tissue comes from the ectoderm. In early development, the outer germ layer differentiates into neural tissue through the formation of the neural plate, which folds to create the neural tube that becomes the brain and spinal cord. Neural crest cells, also derived from ectoderm, contribute to many components of the peripheral nervous system. By contrast, the mesoderm forms muscle, bone, and the cardiovascular system, while the endoderm lines the gut and associated organs. So the nervous system originates from the ectoderm.