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epidermis superficial thinner layer of skin; made of keratinized stratified squamous epithelium dermis layer of dense irregular connective tissue deep to the epidermis keratinocytes the most numerous of epidermal cells; produces keratin melanocyte pigmented cell located between/beneath cells of the deepest layer of epidermis that synthesizes melanin langerhans cell epidermal dendritic cell that functions as an antigen presenting cell during an immune response Merkel cell type of cell in the epidermis of hairless skin that makes contact with tactile disc; functions in touch papillary region 1/5 of total layer of dermis; made of dermal papillae; areolar connective tissue with elastic fibers dermal papillae small finger like projections that increase surface area Meissner corpuscle sensory receptor for sensations of touch; in dermal papillae reticular region attached to subcutaneous layer; made of dense irregular with fibroblasts, bundles of collagen, soem coarse elastic fibers epidermal ridges fingerprints; on palms, fingers, feet, toes; ridges and grooves pulled in not pushed out melanin dark black, brown, yellow pigment found in some parts of the body carotene precursor to vitamin a; yellow orange pigment present in stratum cornelum of epidermis hair follicle structure composed of epithelium and surrounding the root of hair; where hair develops papilla of the hair contains areolar and many blood vessels that nourish hair inflammatory phase blood clot forms in the wound and loosely unites the wound migratory phase clot becomes scap and epithelial cells migrate along fibrin threads and make scar tissue and blood vessels begin to grow proliferation phase extensive growth of epithelial cells beneath scab; blood vessels continue to grow; collagen fibers form maturation phase scab falls off when epidermis is at normal thickness fibrosis process of scar tissue formation hypertrophic scar raised scar that remains within bounds of original wound keloid scar scar extends beyond original bounds of wound