What type of tissue you observe Friday?. Integumentary System Integument: any covering or enclosure...
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Transcript of What type of tissue you observe Friday?. Integumentary System Integument: any covering or enclosure...
![Page 1: What type of tissue you observe Friday?. Integumentary System Integument: any covering or enclosure -Derma: skin Dermatologist?](https://reader036.fdocuments.in/reader036/viewer/2022062421/56649d095503460f949dba97/html5/thumbnails/1.jpg)
What type of tissue you observe Friday?
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Integumentary System
Integument: any covering or enclosure-Derma: skin
Dermatologist?
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Stratified squamous epithelial cells
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Components
• Skin • Accessory features:
– Sudoriferous glands (sweat glands)– Sebaceous glands (oil glands)– Hair– Nails
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Skin accounts for how much of your body weight?
• Average = 15%, 8 pounds
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What is the skin’s square footage?
• Covers up to 22 square feet (2 square meters) if all spread out
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Did you know?
• As a fetus, you had webbed hands and feet
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apoptosis
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Function
• Protection– Cushioning, insulation, first defense
• Healing• Synthesizes vitamin D when exposed to UV• Sensory reception• Maintain homeostasis
– Temperature, Waste, water• Window into inner workings…examples:
– Jaundice, anemia, shock, etc
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Where is the thinnest skin located?
• Eyelids• 0.01 to 0.015 cm thick
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Where is the thickest skin found?
• Palms and heels• About 0.46 cm thick
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Labeling
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Two types of tissue
Epidermis• Moisture proof• Protective outer covering• Thin• Avascular• Outer layer = dead cells• Melanocytes – make
melanin• Constantly shedding
Dermis• Connective tissue• Makes up majority of the
skin• Provides support• Strength and suppleness• “true” skin – stays the same
throughout entire life
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Epidermis and dermis of (a) thick skin and (b) thin skin(which one makes the difference?)
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Epidermis: layers (on left) and cell types (on right)
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Epidermis…
• Stratum germinativum• Cells die as move upwards• Stratum corneum• Cells undergo keratinization
– Tough protein– Deposited within a cell– Hardens and flattens the cells– Makes skin water-resistant
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Dander
• Dead, sloughed off cells• When clump together = dandruff
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How much skin will you lose over your lifetime?
• About 40 pounds of skin cells are shed
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How often is your outer layer of skin “turned over”?
• monthly
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Dermis
• Collagen + elastin in a gel-like substance• Strong and stretchable
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Stretch marks: striae
• Dermal tearing• Extreme stretching of the skin
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Blister
• Separation of epidermal and dermal layers by a fluid-filled pocket
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Dermis…
• Also contains:– Blood and lymph vessels– Nerve endings– Hair follicles– Sweat and sebaceous glands– Collagen and elastin
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tattoos
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Subcutaneous Layer
• Not part of the skin = hypodermis• Loose connective tissue and adipose• Insulates from extreme temperature changes
in external environment• Anchors skin to underlying structure
– Some areas have no subcutaneous layer – connect directly to bone…
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Subcutaneous injection
• Rich supply of blood vessels