Question

The tissues of the nervous system are derived from which germ layer?

• A. Mesoderm
• B. Endoderm
• C. Ectoderm
• D. All of the above

Answer 1

The correct option is (B):

Explanation of the correct option:

1. The neural tissue which includes the brain, spinal cord, nerve cells and neuroglia, is derived from the ectoderm, which is the external germ layer.​
2. The ectoderm also forms the epithelial tissues of the skin and linings of mouth, anus, nostrils, hair and nails.
   

Explanation of the incorrect options:

Option (A):

1. Mesoderm gives rise to the muscles, blood vessels, connective tissues, etc.
2. The entire skeletal system and the heart is made out of the mesoderm along with the formation of urogenital system.
   

Option (C):

1. Endoderm gives rise to the alimentary canal and respiratory tract.
   

Final Answer: The tissues of the nervous system are derived from ectoderm.