Question

The whole nervous system including neuron in frog and other vertebrates is derived from

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

Answer 1

Answer: (A)

Ectoderm

Ectoderm, endoderm and mesoderm are three primary germ layers in the very early embryo. The ectoderm differentiates to form the nervous system (spine, peripheral nerves and brain), tooth enamel and the epidermis (the outer part of integument). It also forms the hair and nails.

So, the correct answer is option A.