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17 Cards in this Set
- Front
- Back
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integument
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interface between the organism and its environment
Consists of Epidermis (Epithelium) Dermis AKA Corium (CT) Hypodermis (Superficial Fascia) |
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EPIDERMIS
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stratified squamous epithelium
Stratum corneum (most superficial layer) Stratum lucidum (not always present) Stratum granulosum (varies in thickness) Stratum spinosum (stratum Malpighii) Stratum basale (stratum germinativum) (deepest layer) |
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Stratum Corneum
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very flat, heavily keratinized cells
no organelles or nucleus present in cells surface layer cells lose their desmosomes |
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Stratum Lucidum
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not present in thin skin
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Stratum Granulosum
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Contain keratohyalin granules
contain membrane-bound lamellar granules that produces a lipid barrier |
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Stratum Spinosum (Malphigii)
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cell periphery has many short projections
producing a lipid seal preventing water evaporation |
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Vitamin D Synthesis
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provitamin D3 found in the Malpighian layer of the skin
undergoes photolysis by UV light to become previtamin D3 |
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Stratum Basale
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source of stem cells for the rest of the epithelium
also find melanocytes |
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Keratinocytes
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Cell of Epidermis that produces keratin
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Langerhans (Dendritic) Cells
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Found in Stratum Spinosum
No Desmosomes, Can Migrate Antigen-Presenting Cell With Class II MHC on Surface |
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Merkel Cells
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Found in basal layer
Sensory for touch |
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What type of Keratin is only found in soles of feet and palms of hands
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K9 - Type I-acidic
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What types of keratin does Stratum Basale have
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K5 - Type II basic
and K14 - Type I acidic |
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What types of keratin does Stratum Spinosum have
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K1 - Type II basic
and K10 - Type I acidic |
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What types of keratin does Stratum Granulosum have
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They stop making keratins
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Dermis
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Contains arrector pili muscles for hair follicle
Areolar CT Type III collagen Dense Irregular Collagenous CT |
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Function of Integument
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Protection
Thermoregulation Water Balance Calcium homeostasis Waste Management Communication Infrmation |
