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Layers of the Integumentary System
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What are the 2 main Layers of the Integumentary System?
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What are the 5 layers of epidermis?
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Deepest layer of epidermis
Single layer, lies on top of Dermis
Mitosis takes place here
Contains: Melanocytes, keratinocytes and granules of melanin
Stratum Basale
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Several layers of keratinocytes, flatter irregular shapes or spiny
Connected with desmosomes
Contains: keratinocytes (dead cells),
melanin (UV shield) and Langerhans cells (activate immune system)
Stratum Spinosum
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Keratohyalin in cytoplasm that forms keratin
Lamellated granules contain glycolipid for:
Water proofing
Slows water loss
Resistant to destruction
Nuclei begin to desintegrate becasue cells are too far from blood suplly
Stratum Granulosum
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Clear band of cells with few layers of indestinct boundaries
Made of dead Karatinocytes
Found only in thick epidermis
Stratum lucidum (clear)
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Outermost layer
20-30 shingle like
Waterproofing layers
Protects from biological, chemical, and physical assaults
Stratum Corneum
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What are the 2 layers of the Dermis?
- Papillary (superficial layer)
- Reticular (deeper layer)
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Layer that consists of collagen and elastin giving framework to Areolar tissue
Abundant in blood vessels, pain receptors (nerve endings), and
Meissner's Corpuscles (touch receptors)
Dermal ridges contain sweat glands along the crest (finger prints)
Papillary Layer
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Layer made of collagenous fibers (elastic and reticular)
collagen binds water, elastin stretch and recoil
contain tension lines and flexure lines (joints)
Striae: strecth marks are tearing of the dermis
Reticular Layer
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How many layers of the dermis are there?
What are they?
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How many layers of epidermis are there?
What are they?
- 5
- Stratum Basale
- Stratum Spinosum
- Stratum Granulosum
- Stratum Lucidum
- Stratum Corneum
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What skin layer contains flexible areolar tissue in the uppermost layer and
Dense Irregular CT in the deeper layer?
Dermis
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What controls skin color?
Melanin
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What is Redness in the skin called?
Blood vessel dialation due to blushing, fever, hypertension or
allergic reaction.
Erythema
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Another word for paleness?
blood vessel constriction due to fear, stress, anemia
and hypotension
Pallor
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This is a condition due to a liver disorder spilling bile pigments
into tissues
Jaundice
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Bruising due to blood escaping from the blood vessels
and clotting underneath?
Hematoma
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