For example, we have the nails, we have the hairs and we have the hair follicles. We have the sebaceous glands, the oil glands. We also have the sweat glands that are formed by the ectoderm germ layer. We also form the sensory cells as well as melanocides. So melanocides are those cells that not only give us pigment but also protect us from UV radiation that comes from the sun. So the integrationary system found on the outside is formed from the ectoderm, which is the outermost layer of that developing embryo.