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