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Cards In This Set
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What makes up integumentary system?
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Hair, Nails, Skin, and Cutaneous glands
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Skin alone is called...
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Integument
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Collectively nails, hair, and cutaneous glands are called...
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Accessory Organs
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2 layers of skin:
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Epidermis - stratified squamous
Dermis - deeper CT layer
Hypodermis - not part of skin
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What are major functions of skin?
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Resistance to trauma and infection, Water retention, Synthesis of Vit D, Sensation, Thermoregulation, Nonverbal Comm.
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Describe Epidermis
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Keratinized, strat. sq. epi.
surface is dead cells packed w/keratin
avascular, depends on CT
sparse nerve endings
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List cell types in epidermis (5)
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Stem cells, Keratinocytes, Melanocytes, Tactile/Merkel cells, Dendritic/Langerhans cells
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What is a stem cell?
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Undifferentiated cells that undergo mitosis and produce keratinocytes, found only in stratum basale
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What is keratinocyte?
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Majority of epidermal cells, synthesize keratin
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What is melanocyte?
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Only in strat. basale, synthesize melanin, long branching processes
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What is tactile/merkel cell?
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Few in number, receptors for sense of touch, found in basal layer of epidermis, associated w/underlying dermal nerve fiber
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What is dendritic/langerhans cells?
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Found in 2 layers of epidermis. strat. spinosum andgranulosum, macrophages that stand guard against pathogens that penetrate skin
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Name layers of epidermis (superficial to deep)
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Stratum corneum, s. lucidum, s.granulosum, s. spinosum, s. basale
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Describe Stratum Corneum
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Consistus of up to 30 layers of dead, scaly, keratinized cels that form a durable surface layer resistant to abrasion, penetration and water loss
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Describe Stratum Lucidum
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Thin, transluscent zone seen only in thick skin, keratinocytes are densely packed with eleidin
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