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lesson 3 med term 1.docx - Lesson 3 Introduction The organs...

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Lesson 3IntroductionThe organs of the integumentary system include the skin, hair, nails (both fingernails and toenails),sebaceous (pronounced seb-ACE-shuss) glands and sweat glands.The integumentary system is an extremely large, flat, flexible body system that covers the entiresurface of the body. The primary functions of the integumentary system are protection, temperatureregulation, and secretion of fluids. The integumentary system also houses nerve receptors.OBJECTIVESThis chapter covers the integumentary system and the combining forms and abbreviations used inbuilding the words that relate to it. Upon completion of this chapter, you should be able to:oName the parts of the integumentary system and discuss their functionsoDefine combining forms used in building words that relate to the integumentary systemoName the common diagnoses, laboratory tests, and clinical procedures used in treating theintegumentary systemoDefine the major pathological conditions, surgical terms and pharmacological agents relatedto the integumentary systemSkinEditorNovember 27, 2016The skin is a vital organ that covers the entire outside of the body, forming a protective barrieragainst pathogens and injuries from the environment. The skin serves as a protective membraneagainst invasion from bacteria and other potentially harmful organisms. It is the body’s largest organand contains millions of nerve receptors that detect pain, touch, heat, cold and pressure. The skinalso contains thousands of sweat glands which assist in maintaining the body’s internal temperatureby secreting sweat. Blood vessels located in the skin also help to regulate the body’s temperatureby constricting and dilating as appropriate.The skin is composed of three layers:oTheepidermis(pronounced: eppy-dermis) is the thin, outer membrane layer.oThedermisis the middle, fibrous connective tissue layer.oThesubcutaneous(pronounced sub-cue-tane-ee-us) layer is the innermost layer that iscomposed of fatty tissue.
Image Source:OpenStax College, Anatomy & Physiology. OpenStax College. FoundHere.The EpidermisEditor November 27, 2016The epidermis is the outermost layer of the skin, and protects the body from the environment. Thethickness of the epidermis varies in different types of skin; it is only .05 mm thick on the eyelids, and is1.5 mm thick on the palms and the soles of the feet. The epidermis contains the melanocytes (the cellsin which melanoma develops), the Langerhans’ cells (involved in the immune system in the skin), Merkelcells and sensory nerves. The epidermis layer itself is made up of five sublayers that work together tocontinually rebuild the surface of the skin.layers-of-the-epidermis
The epidermis of thick skin has five layers: stratum basale, stratum spinosum, stratum granulosum,stratum lucidum, and stratum corneum.

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