Post on 18-Dec-2015
Sponge: Set up Cornell Notes on pg. 50
Topic: Ch. 6 Integumentary System: Layers of the Skin
Essential Question:
2.1 Atoms, Ions, and Molecules
6.3 Layers of the Skin
Split pg. 50 into 4 squares
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Epidermis Skin Layers
Video Notes
• 15 bullets
Tree Map: Epidermis and Dermis
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Layers of Skin
• 1. Epidermis
• 2. Dermis
•Subcutaneous layer or hypodermis• beneath dermis • NOT part of skin
The skin includes 2 distinct tissue layers:
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• Made up of stratified squamous epithelium• Lacks blood vessels• is nourished by dermal blood vessels
• As new cells grow- • push old cells farther from nutrient supply and they
die• Become keratinized- hardens, becomes waterproof• Eventually shed
Epidermis
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• Thickest on palms and soles of feet• Thin everywhere else (0.07-0.12mm thick)
• Cell division is higher in areas where skin is rubbed or pressed regularly (Hypothesize why?)
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• Melanocytes- specialized cells that produce the dark pigment melanin• Provides skin color• Absorbs UV rays• Prevents mutations in the DNA or skin cells and
other damaging effects
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Epidermis
Layers of Epidermis• stratum corneum• stratum lucidum• stratum granulosum• stratum spinosum• stratum basale
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• Binds epidermis to underlying tissues• on average 1.0-2.0mm thick
Composed of:• irregular dense connective
tissue• muscle cells• nerve cell processes• specialized sensory
receptors• blood vessels• hair follicles• glands
Dermis
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Tattoos
• Ink injected into the dermis• Color is permanent• Dermis cells are not shed!
Tattoo Removal• Lasers shatters ink
molecules• Immune system removes
debris• Before lasers, tattoos were
scraped, frozen, or cut away
• PAINFUL!!!!!
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Video:
The Tattoo Removal Process
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Subcutaneous Layer
Composed of:
• loose connective tissue
• adipose tissue• major blood vessels
• NOT part of the skin• Binds the skin to underlying organs• Insulates
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Video:
The Layers of the Human Skin
• Please add information to your pictures from the video
-Layer of dead fat tissue