Which of the following structures of an embryo are derived from the ectoderm?

• A. Muscular system
• B. Circulatory system
• C. Digestive tract lining
• D. Nervous system

Answer: (D)

Verified step by step guidance

1. Understand the three primary germ layers in embryonic development: ectoderm, mesoderm, and endoderm. Each layer gives rise to specific structures and systems in the body.
2. Identify the structures derived from the ectoderm. The ectoderm is the outermost layer and primarily forms structures such as the nervous system, skin, and sensory organs.
3. Recognize that the nervous system, including the brain and spinal cord, is a key structure derived from the ectoderm.
4. Differentiate between the germ layers: the mesoderm forms structures like the muscular and circulatory systems, while the endoderm forms the lining of the digestive tract.
5. Apply this knowledge to the problem: the muscular system, circulatory system, and digestive tract lining are not derived from the ectoderm, but the nervous system is.