NEET BIOLOGY

Detailed explanation-1: -The ectoderm is one of the three primary germ layers formed in early embryonic development. It is the outermost layer, and is superficial to the mesoderm (the middle layer) and endoderm (the innermost layer). It emerges and originates from the outer layer of germ cells.

Detailed explanation-2: -germ layer, any of three primary cell layers, formed in the earliest stages of embryonic development, consisting of the endoderm (inner layer), the ectoderm (outer layer), and the mesoderm (middle layer).

Detailed explanation-3: -Surface Ectoderm Forms Epidermis The surface ectoderm covering of the embryo consists initially of a single layer of cells. After neurulation in the fourth week, the surface ectoderm produces a new outer layer of simple squamous epithelium called theperiderm (Fig.

Detailed explanation-4: -Ectoderm-It is the outermost layer that forms nails, hair, etc. Endoderm-It is the innermost layer that forms the stomach, colon, urinary bladder, etc. Mesoderm-It is the middle layer between ectoderm and endoderm which forms bones, cartilage, etc.

Detailed explanation-5: -Endoderm is the innermost of the three primary germ layers in the very early embryo. The other two layers are the ectoderm (outside layer) and mesoderm (middle layer). Cells migrating inward along the archenteron form the inner layer of the gastrula, which develops into the endoderm.