Question

Which one of the following is derived from the ectoderm?

• A. Muscle
• B. Bone
• C. Nerve
• D. Blood

Hint:

Remember: “Ecto” means outer – it forms the nervous system and skin. “Meso” forms muscles, bones, and blood. “Endo” forms internal linings.

Answer 1

The Correct Option is C

Step 1: Understand the germ layers.
During embryonic development, three primary germ layers are formed:
Ectoderm: the outer layer
Mesoderm: the middle layer
Endoderm: the inner layer
Step 2: Identify derivatives of the ectoderm.
The ectoderm gives rise to:
Nervous system (brain, spinal cord, nerves)
Epidermis (skin, nails, hair)
Sensory organs (like eyes and ears)
Parts of the pituitary and adrenal medulla
Step 3: Identify the origin of other options. Muscle – Derived from mesoderm
Bone – Also from mesoderm
Blood – Originates from mesoderm
Nerve – Derived from ectoderm Step 4: Conclusion.
Only nerve tissue originates from the ectoderm, making option (3) the correct answer.