ANATOMY

Detailed explanation-1: -Three primary germ layers Gastrulation is a key phase in embryonic development when pluripotent stem cells differentiate into the three primordial germ layers: ectoderm, mesoderm and endoderm.

Detailed explanation-2: -Which of the following is NOT a major germ layer formed during gastrulation? Explanation: The correct answer is cytoderm. There are three major germ layers formed during gastrulation: the ectoderm, mesoderm, and endoderm.

Detailed explanation-3: -The ectoderm is also sub-specialized to form the (2) neural ectoderm, which gives rise to the neural tube and neural crest, which subsequently give rise to the brain, spinal cord, and peripheral nerves. The endoderm gives rise to the lining of the gastrointestinal and respiratory systems.

Detailed explanation-4: -The correct answer: The only option which is not an embryonic germ layer is a. Epidermis. There are three main germ layers in the embryo which later form different structures in the fetus. The outer layer is known as the ectoderm, the middle layer is known as the mesoderm, and the inner layer is known as the endoderm.