Question

The epiblast (outer germ layer of gastrula) forms the

• A. Ectoderm
• B. Mesoderm
• C. Endoderm
• D. None of the above

Answer 1

The correct option is A Ectoderm

Mammalian embryogenesis, which involves a series of differentiation and segregation of the inner cell mass of the blastocyst, develops into two distinct layers i.e. primitive ectoderm or epiblast and the primitive endoderm or hypoblast. Epiblast is defined as the outermost layer of the embryo before it differentiates into ectoderm and mesoderm. The epiblast forms the ectoderm, whereas hypoblast forms the endoderm.