cross section of skin layer with intact collagen, elastin fibers and fibroblasts in the dermis .

skin collagen elastin fibers fibroblasts protein amino acid structure cell strength flexible cross intact young healthy produce wrinkles tissue formation synthesis stretched shape production layer epidermis dermis hypodermis muscles lines firm aging age body vector diagram infographic flat design schematic blood vessels childhood aesthetic dermatology beauty abundant reduce exposure biology repair damage white background produced organ background fibroblasts