NEET BIOLOGY

Detailed explanation-1: -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-2: -The ectoderm gives rise to the skin and the nervous system. The mesoderm specifies the development of several cell types such as bone, muscle, and connective tissue. Cells in the endoderm layer become the linings of the digestive and respiratory system, and form organs such as the liver and pancreas.

Detailed explanation-3: -The nervous system develops from the ectoderm following an inductive signal from the mesoderm. The initial mesodermal cells condense to form the notochord, which elongates under the primitive streak along the anterior-posterior axis of the developing embryo.

Detailed explanation-4: -Ectoderm is the precursor of the nervous system and skin, mesoderm of the cardiac and skeletal muscle, skeleton, and connective tissue, and endoderm of the gut.