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Chapter 7 Skin Structure, Growth, & Nutrition
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Learning Objectives Describe the structure and composition of the skin.List the six functions of the skin.Name the classes of nutrients essential for good health.Identify the food groups and dietary guidelines recommended by the U.S. Department of Agriculture (USDA).List and describe the vitamins that can help the skin.
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Introduction ⢠The skin is the largest organ of the body!â¢It is a direct reflection of the nutrients you eat and the healthy habits you keep.⢠Cosmetologists are not allowed to diagnose, prescribe, or provide any type of treatment for abnormal conditions, illnesses, or diseases.⢠Refer clients with medical issues to dermatologists more than to any other type of physician.
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Know the Anatomy of the Skin DermatologyThe medical branch of science that deals with the study of skin and its nature, structure, functions, diseases, and treatment.DermatologistA physician who specializes in diseases and disorders of the skin, hair and nails. (continues)
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CosmetologistOne skilled in the cleansing, beautification, and health preservation of the skinEstheticianSpecializes in cleansing, beautification, and health preservation of the skin Know the Anatomy of the Skin (continued)
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Largest organ of the bodyCovers two square yardsWeighs six to nine poundsProtects muscles, bones, nervesNatural barrier between our bodies and the environmentHealthy skin should be free of any visible signs of disease, infection, or injury Skin Specifics
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Healthy skin: slightly moistsoft and flexiblesmooth and fine-grainedsurface that is slightly acidicimmune responses that react quickly to organisms that touch or try to enter it Skin Specifics (continued) (continues)
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Continued pressure causes calluses Appendages of the skin include hair, nails, and sudoriferous (sweat) and sebaceous (oil) glands.The skin of the scalp has larger and deeper hair follicles to accommodate the longer hair of the head. Skin Specifics (continued) (continues)
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The skin is composed of two main divisions: the epidermis and the dermis Skin Specifics (continued)
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The Epidermis Stratum corneum Stratum lucidum (continues) Stratum granulosum Stratum spinosum Stratum germinativum Melanocytes
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The Dermis Dermis is the underlying, inner layer of the skin.Papillary layer: outer layer beneath epidermis (continues)
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The Dermis (continued) Reticular layer: deeper layer of dermisSubcutaneous tissue: fatty layer below dermis
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Fluids of the Skin The blood supplies nutrients, molecules from food such as protein, carbohydrates, and fats, to the skin.Lymph bathes skin cells, removes toxins and cellular waste, and has immune functions that help protect the skin and body against disease.
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Nerves of the Skin Motor nerve fibers: cause goose fleshSensory nerve fibers: send messages to brainSecretory nerve fibers: regulate perspiration
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Sense of Touch Nerve endings are found in the papillary layer.They register sensations:TouchPainHeatColdPressure
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Skin Color Depends primarily on melanin (continues)
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Skin Color (continued) The color of the skin is a hereditary trait and varies among races and nationalities. Genes determine the amount and type of pigment produced in an individual.Melanin: tiny grains of pigment in stratum germinativumPheomelanin: red to yellow in colorEumelanin: dark brown to black in color
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Strength and Flexibility of Skin Two structures, collagen and elastin, make up 70 percent of the dermis and give strength, form, and flexibility to skin. Collagen: a fibrous protein allowing skin to stretch and contractElastin: a protein base that forms elastic tissue; gives skin elasticity
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Glands of the Skin Sudoriferous (sweat) glands (continues) Sebaceous (oil) glands
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Sebaceous GlandsOpen Comedo: blackheadClosed Comedo: whiteheadAcne: chronic inflammation of sebaceous glandsPapule: small, round elevation on skinPustule: inflamed pimple containing pus Glands of the Skin (continued)
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Functions of the Skin ProtectionSensationHeat regulationExcretionSecretionAbsorption
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Promote Nutrition and Skin Health Essential NutrientsCarbohydratesFatsProteinsVitaminsMineralsWater (continues)
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Promote Nutrition and Skin Health (continued) My Plate Courtesy of U.S. Department of Agriculture.
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Dietary Guidelines Eat a variety of foods.Eat fruits, vegetables, and grains.Eat moderate salt and sugar.Drink an appropriate amount of water.Minimize alcohol intake.Exercise appropriately.Maintain/improve body weight.
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Vitamins and Dietary Supplements Vitamin A: improves elasticity and thicknessVitamin C: accelerates healing processVitamin D: enables absorption of calciumVitamin E: protects against sunâs rays
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Water and the Skin Comprises 50 to 70 percent of bodyâs weightSustains the health of cellsAids in elimination of toxins and wasteHelps regulate body temperatureAids in proper digestion
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Summary and Review The skin:Is the largest organ of the body and protects us from the environment. Regulates body temperature. Provides sensation. Affected quite easily by most salon services
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Chapter Review Questions Define dermatology.Briefly describe healthy skin.Name the main divisions of the skin and the layers within each division. (continues)
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4.List the three types of nerve fibers found in the skin.5.Name the two types of glands contained within the skin and describe their functions.6.What are collagen and elastin?7.Explain how collagen and elastin can be weakened. Chapter Review Questions (continued) (continues)
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8. What are the six important functions of the skin?9. What are the six classes of nutrients that the body needs and how are they obtained? Chapter Review Questions (continued) (continues)
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10.What are the five basic food groups?11.Can the skin be nourished with cosmetic products? Chapter Review Questions (continued) (continues)
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12.Name four vitamins that can help the skin and describe how they help.13.What is the one essential item that no person can live without, and why is it essential to the skin and body? Chapter Review Questions (continued)
