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What does the integumentary system consist of?
hair, nails, sweat glands, sebaceous glands
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Integument is also called the __________ ___________
cutaneous membrane
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What is the scientific study of the integumentary system?
dermatologist
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how much of the body weight is the integumentary system?
7-8%
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What tissues are in the integumentary?
all tissue types
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surface of the skin is covered by.....
epithelium
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what underlies the epithelium?
connective tissue
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What are the layers of integument?
- epidermis
- - stratified squamous keratonzed epithelium
- Dermis
- -subcutaneous layer
- - Dense irregular connective tissue
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what are the layers of the epithelium from deep to superficial?
- Stratum Basal
- Stratum Spinosum
- Stratum Granulosum
- Stratum Lucidum
- Stratum Corneum
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Which layers consist of living keratinocytes?
the first 3 layers from deep to superficial
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Stratum Basal is also known as the....
Basal layer
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what separates the epithelium the the dermis?
basal layer with underlying cubodial and low columnar cells
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Stratum _______ is occupied by _____,_____,______
- basale
- keratinocytes
- melanocytes
- tactile cells
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what is the most abundant cells in the epithelium?
keratinocytes
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What are Melanocytes used for? and in what form? In response to what?
- Produce and store pigment
- Melanin
- UV light
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What are melanosomes and where are they transferred?
- Pigment granules
- into keratinocytes
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Merkel cells are....
Tactile Cells
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what out of the three cells in the stratum basil are sensitive to touch?
Tactile Cells
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What do Tactile cells do when touched?
simulate sensory nerve endings by the release of chemicals
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which layer of stratum has several layers of polygonal keratinocytes?
stratum spinosum
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What happeneds to the daughter cells from the stratum basal?
pushed into the next superficial layer
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where can you find epidermal dendritic cells?
stratum spinosum and stratum granulosum
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What are Epidermal Dendritic cells? Responsive to?
- immune cells that help initiate immune response
- responsive to pathogens
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What is the Stratum Granulosum mainly known for?
first layer of Keratinization
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what is keratinization?
the process where keratinocytes fill with keratin
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Process of keratinization
- keratinocytes fill with keratin
- causes nucleus and organelles to disinegrate
- fully keratinized cell dead but structurally sound
- move to the superficial layers
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where is stratum lucidum found?
only on thick skin
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where is translucent proteins, Eleidin found?
stratum lucidum
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how many dead layers are in the stratum corneum?
20-30 dead layers
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