Lec09 - Chapter 5: Integumentary System Skin : The Largest...

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Unformatted text preview: Chapter 5: Integumentary System Skin : The Largest Organ. Tough outer protective covering Functions: 1. Protection 2. Defense 3. Prevention of Dehydration 4. Body Temperature 5. Excretion of Waste 6. Reception of Stimuli 7. Vitamin D Synthesis 8. Communication 1. Protection - of underlying tissues and organs from fluid loss, abrasion and impact and chemical attack and microbial infection. 2. Defense- against microbes 3. Excretion- of salts, water and organic wastes and by integumentary glands. 4. Thermoregulation of body temperature via evaporation or insulation( Keratin) 5. Synthesis of Vitamin D3 , a steroid, a hormone necessary for normal calcium absorption. 6. Detection of touch , pressure, pain general senses that are relayed to the Functions of SKIN or Subcutaneous Membrane What is it? The skin and its derivatives (sweat and oil glands, hair and nails) serve a number of functions, mostly protective. Integumentary System Skin Structure Figure 4.4 Or cornification, is the formation of protective , superficial layers of cells filled w/ keratin. Keratinization Epidermis outer layer Stratified squamous epithelium Often keratinized (hardened by keratin) Dermis Aeeolar and Dense Irregular Connective saaaive tissue Skin Structure Figure 4.3 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 1st layer SKIN: 2 TISSUES Thickness = 0.6mm to 3mm Composition collagen, elastic and reticular fibers, fibroblasts Dermal papillae - extensions of the dermis into the epidermis forming the ridges of the fingerprints Layers papillary layer reticular layer is deeper part of dermis 6 Dermis The Dermis 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 Dermis:Components & Characteristics Subcutaneous Layer Located under the dermis Mostly adipose Functions energy reservoir thermal insulation Hypodermic injections highly vascular Layers of Epidermis 6 Cell and Layers of the Epidermis Layers of Epidermis Stratum basale (germinativum) Stratum spinosum (prickly layer) Stratum granulosum (granular) Stratum lucidum (clear layer) Stratum corneum (horny layer) E p id e r m a l C e ll T yp e s...
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Lec09 - Chapter 5: Integumentary System Skin : The Largest...

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