Chap4 - Chapter 4: Integumentary System Integumentary...

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Chapter 4: Integumentary System
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Integumentary System What is it? The skin and its derivatives (sweat and oil glands, hair and nails) serve a number of functions, mostly protective.
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Skin Structure Figure 4.4
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Skin Structure Epidermis – outer layer Stratified squamous epithelium Often keratinized (hardened by keratin) Dermis Dense connective tissue Figure 4.3
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Characteristics 16% of your total body weight First line of defense against microorganisms Irradiated by sunlight 1.5-2 M squared in area There are 2 major components: 1) cutaneous membrane (skin) and 2) accessory structures (nails, hair and exocrine glands).
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Keratinization Or cornification, is the formation of protective , superficial layers of cells filled w/ keratin.
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Functions of SKIN or Subcutaneous Membrane 1. Protection - of underlying tissues and organs from fluid loss, abrasion and impact and chemical attack and microbial infection. 2. Excretion - of salts, water and organic wastes and by integumentary glands. 3. Maintenance- of body temperature…via evaporation or insulation( Keratin) 4. Synthesis of Vitamin D3 , a steroid, a hormone necessary for normal calcium absorption. 5. Detection of touch , pressure, pain…general senses that are relayed to the central nervous system.
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SKIN: 2 TISSUES 1 . Epidermis- Contains either 4 or 5 layers depending on if THIN or THICK skin. THIN: covers most of body ( 4 layers)(.08mm) THICK: soles of feet, palms of hands (.5mm) (5 layers here. Stratum: 1. germantivum(basale) 2. spinosum, 3.granulosum, 4. Lucidum ( only in thick skin) , and 5 . corneum. Example: Stratum germativum (basale)for 1 st layer
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Dermis:Components & Characteristics 2 COMPONENTS: 1) Papillary Layer - Consists of Areolar Tissue. Contains capillaries, lymphatics, and sensory neurons that supply the surface of the skin. Projections: Dermal Papillae. 2) Reticular Layer - deep to the PL, Contains blood vessels, deep pressure receptors called* Pacinian corpuscles and Macrophages. Also tissue : consists of interwoven layer of connective tissue; containing collagen and elastin fibers. Appendage structures extend into dermis.
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Thicker than epidermis Contains connective tissue; elastic fibers, collagen, nervous tissue, smooth muscle and blood;receptors and glands are found here. A basement membrane separates the
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This note was uploaded on 12/08/2011 for the course AMY 10 taught by Professor Dianeolin during the Winter '09 term at Riverside Community College.

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Chap4 - Chapter 4: Integumentary System Integumentary...

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