Question

Soon after the three germ layers are formed in a developing embryo, the process of organogenesis starts. The human brain is formed from the

• A. Ectoderm
• B. Endoderm
• C. Mesoderm
• D. Partly endoderm and partly mesoderm

Answer 1

Answer: (A)

Ectoderm

• In embryonic development, gastrulation is the stage characterized by the formation of three germ layers- ectoderm, mesoderm, and endoderm.
• The cells of these germ layers result in the production of all types of tissues in the body of the organism.
• Ectoderm is the outer layer and endoderm is the inner layer. Mesoderm is the middle layer.
• Ectoderm gives rise to the central nervous system that includes the brain and the spinal cord. The ectoderm also gives rise to the peripheral nervous system

So, the correct answer is 'Ectoderm'