Skin, Hair and Nails.stu

Skin, Hair and Nails.stu - Skin, Hair and Nails Skin, Hair...

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Unformatted text preview: Skin, Hair and Nails Skin, Hair and Nails Integumentary System Largest organ in the body Functions Protects tissue from trauma and bacteria Prevents loss of water and electrolytes Regulates body temp Senses pain, touch, temperature and pressure Synthesizes Vitamin D Promotes would repair Skin, Hair and Nails Layers of the Skin Epidermis – outer layer Thin except for palms and soles Protective barrier Avascular Contains melanocytes Dermis – inner, supportive layer Consists of connective tissue or collagen Elastic tissue Blood vessels, nerves, hair follicles, sweat and sebaceous glands Skin, Hair and Nails Layers of the Skin Subcutaneous Lies below dermis Adipose tissue Stores fat for energy Provides insulation for temperature control Skin, Hair and Nails Epidermal Appendages Hair Made from keratin, shaft and root Cells produced in bulb matrix at root Growth cyclical Vellus hair – fine, faint Covers most of body Terminal hair – dark, thick Grows on scalp, eyebrows, axillae, pubic area, face Skin, Hair and Nails Epidermal Appendages Sebaceous Glands Produce sebum, productive lipid substance Oils and lubricates skin and hair Found on scalp, face, forehead, chin, not palms and soles Skin, Hair and Nails Epidermal Appendages Sweat Glands Eccrine glands Open directly on skin surface Produce sweat Regulates body temperature Apocrine glands Open into hair follicles Secrete thick, milky substance Located mainly axillae and genital areas Active during puberty Skin, Hair and Nails Epidermal Appendages Nails Hard plates of keratin Nail plate is clear Vascular epithelial cell under nail bed – pink color Lunula – white, opaque semilunar area at proximal end of nail Matrix is site of nail growth Skin, Hair and Nails Developmental Considerations Infants and Children Hair follicles develop in fetus 3 mo. Gestation Lanugo – fine, downy hair of newborn Vernix Caseosa – thick, cheesy substance Skin – thin, elastic, permeable – risk for fluid loss Sebum produces milia and cradle cap Temperature regulation is not developed Eccrine glands do not secrete sweat Subq layer not developed – vulnerable to cold Skin, Hair and Nails...
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This note was uploaded on 05/31/2011 for the course NUR 326 taught by Professor Meneghini during the Fall '10 term at St. Xavier.

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Skin, Hair and Nails.stu - Skin, Hair and Nails Skin, Hair...

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