👉 Ectomeres are structures that form from the basal cell layer of the skin. They are composed of a layer of keratin, which is responsible for providing protection against external stimuli and maintaining the integrity of the skin. Ectomeres can be classified into three main types: epidermis (the outermost layer), dermis (a layer of cells that covers the surface of the skin), and mesoderm (the middle layer that develops from the dermis).