Ch. 22 Integumentary System
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| 5 Functions of Integumentary System | 1. Protection
2. Regulation
3. Sensation
4. Absorption
5. Secretion
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| 3 layers of skin | 1. Epidermis
2. Dermis
3. Subcutaneous Layer
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| Epidermis | -4 layers
-contains melanin which gives skin its color
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| melanin | gives skin its color
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| 4 layers of Epidermis | 1. stratum corneum
2. stratum lucidum
3. stratum granulosum
4. stratum germinativum
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| Dermis | -"true skin"
-contains dermal papillae aka fingerprints
-2 layers
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| 2 layers of Dermis | 1. Papillary
2. Reticular
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| shaft | visible portion of the hair
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| papillae | found at the base of the hair follicle
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| nail | consists of body, root and matrix (nail bed)
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| lunula | crescent-shaped white area at base of nail
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| matrix of nail | nail bed
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| sebaceous glands | -located in the dermis
-secrete sebum
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| sudoriferous glands | secrete perspiration
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| skin cancer | most common of all cancers
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| malignant | cancerous tumor
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| basal cell carcinoma | most common form of skin cancer
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| location of skin cancer | -nose is most common
-also occurs on head, neck, back, chest and shoulders
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| squamous cell carcinoma | malignant tumor that affects the middle layer of the skin
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| malignant melanoma | -originates in the melanin-producing melanocytes
-often occurs in the melanocytes of a pre-existing mole
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| ABCDE Rule | Diagnostic tool for malignant melanomas
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| acne vulgaris | -most often affects teens
-severity of the acne determines the most useful and beneficial treatment
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| alopecia | -baldness or loss of hair
-most common is male-pattern baldness
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| cellulitis | acute, spreading bacterial infection below surface of the skin
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| contact dermatitis | -allergic reaction
-poison oak for example
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| decubitus ulcer | -pressure sore or bedsore
-common location is coccyx
-4 stages I-4 (most severe)
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| eczema | atopic dermatitis
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| Herpes Zoster | -aka shingles
-viral infection that causes a painful rash that is also responsible for chicken pox
-painful, fluid-filled blisters
-treated with oral anti-viral meds
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| hirsutism | thick abnormal hair growth
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