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Functions of the skin Protection Excretion Temperature regulation Sensory perception Synthesis of Vitamin D Consists of two layers Epidermis Dermis Hypodermis Below the dermis Epidermis Stratified squamous epithelium Contains no blood vessels or nerves Protects the body agains (entrance of pathogens, ultraviolet radiation, excessive water loss) Epidermal Layers Stratum basale Stratum Corneum Stratum Basale innermost later of epidermis site of mitotic cell division New cells move from the stratum basale toward the surface Stratum corneum outermost layer numerous layers of dead, flat, keratinied cells constantly sloughed off and replaces two weeks for anew cell to move through the epidermis Dermis compsed of fibrous connective tissus Dermal papillae Dermal Papillae forms fingerprints and toe prints Hypodermis/Subcutaneous Layer loose connective tissueand adipose tissue attaches sking to underlying tissues site for subcutaneous injections site of white blood cell action fat storage Hair follicle contains the hair root bulb f follicle is site of new hair growth Arrector pili muscle contracts and raises the hairin the follicle on end Nails on dorsal surface of fingers and toes Keratinized epidermal cells Body Root Lunula Functions are protection and object manpulation Glands form from epidermal cells that grow inward into the dermis Three types of integumentary glands Sebacceous Sudoriferious Ceruminous Sebaceous Glands Oil producing glands Empty sebum into hair follicles increase pliability and softness of skin and hair inhibit bacterial growth Sudoriferous (sweat) Glands Apocrine sudoriferous glands Eccrine sudoriferous glands Apocrine Sudoriferous Glands Empty secretion into hair follicle loacted in axillary and gential regions Activate in puberty Odorless- BO due to bacterial Eccrine Sudoriferous Glands occur all over the body Secrete sweat onto skin surface cleary, watery activated with increase of body temperature functions to cool body Ceruminous gland Ear Wax external auditory canal keeps foreign particles and insects out of auditory canal