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23 Cards in this Set
- Front
- Back
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Integument
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Largest organ of the body
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Epidermis Characteristics
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A) Keratinizing Stratified Squamous Epithelium
B) 30-50 Cell layers thick C) Ectoderm origin |
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5 Specific Epidermal Layers
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Stratum Basale
Stratum Spinosum Stratum Granulosum Stratum Corneum Stratum Lucidum |
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Stratum Basale
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Bottom Layer
Single mitotic later with melanocytes New Epidermis every 25-30 days |
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Stratum Spinosum
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Above Stratum Basale layer
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Stratum Granulosum
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Keratin production
Below Stratum Corneum |
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Stratum Lucidum
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Thin layer in palms and soles
Between Stratum Granulosum and Stratum Corneum |
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Stratum Corneum
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Thickest layer
Filled with Keratin Outer most layer |
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Dermis
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Highly innervated, providing vascular support to epidermis
Mesoderm origin - Connective tissue |
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Specific Dermis Layers
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Papillary Layer
Reticular Layer |
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Papillary Layer
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Composed of Areolar Connective Tissue
Dermal Papillae + Epidermal Pegs = Fingerprints |
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Reticular Layer
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Composed of Dense Irregular Connective Tissue
Stretch marks (Linea Albicans) tears in collagen fibers of dermis Lines of Cleavage identifies orientation of collagen fibers |
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Hypodermis
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Subcutaneous Layer
Not part of the Integument Composed of Areolar Connective Tissue and Adipose Cells Binds Dermis to muscles and bones Stores lipids to insulate body Regulates temperature Injection site for drugs |
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Coloration of the skin
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Melanin
Carotene Hemoglobin |
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Melanin
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Protects against UV Rays
Freckles are aggravated patches of melanin |
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Carotene
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Yellowish pigment found in epidermis and dermis
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Hemoglobin
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Blood gives skin pinkish tone
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Cyanosis
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Blue discoloration of skin
Lack of oxygen Look at lips and nail bed |
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Jaundice
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Yellow discoloration due to excess bile pigment
Indication of liver problems |
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Integument Protection
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Physical barrier to water and UV rays
Oily secretions from sebaceous glands retard growth of most pathogens |
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Integument Protection of Water Loss
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Epidermis is water resistant
Main danger of burns is dehydration Keratin and Sebum help skin to be water resistant |
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Integument Regulation of Temperature
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Heat loss:
Dilated blood vessels, evaporation of sweat, heat exhaustion, heat stroke Heat Maintenance: Shivering of muscles, Arrector Pili muscles goose bumps, Hypothermia |
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Integument Synthesis
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Melanin and Keratin
Epidermal Cells + Dehydrocholesterol + UV Light = Vitamin D3 |
