Integumentary Flashcards
2 primary levels of skin
Epidermis and dermis
Functions of skin
Protection, excretion, homeostasis of body, production of melanin, keratin, vit d, storage of lipids, detection, coordination of immune response
2 types of skin
Thick skin 5 layers
Thin skin 3 or 4 layers
Epidermal layers
- Stratum basale
- stratum spinosum
- Stratum granulosum
- Stratum lucidim
- Stratum corneum
Explain stratum basale
Attach to basement by hemidemosomes, only layer that goes through mitosis.
Explain stratum Spinosum
8-10 layers, demisomes present. Giive strength to dermis, lots of mRNA
Explain stratum granulosm
Thin, where keratin production begins, nucleus degenerates
Explain stratum lucidim
Clear, no nucleus present. No thin ski , cells flat and packed together with proteins
Explain stratum corneum
Horney layer. Keratin filled. Outermost layer
What factors influence skin color
Type and amount of melanin, carotene, body temp-how much blood is in skin
Dermis’ two layers
papillary and reticular layer
Dermis main function
Support epidermis
Describe papillary layer
More superficial than reticular ,contains sensory neurons, areolar and loose connective tissue
Function of papillary layer
Supply blood and nutrients to epidermis
Reticular layer
Hair follicles, glands, receptors, bigger blood vessels, arector pili
Hypodermis function
Mostly adipose and areolar tissue, connects skin to underlying tissue
Sabaceous glands
Associated with hair, become active puberty. Sebum keeps hair and skin flexible
Sweat glands
Merocrine-most numerous. Not associated hair, produce perspiration
Aprocrine- associated w hair, found in areola. Armpits and anus
Ceruminous glands
Ear canals- make ear wax
Mammary glands
Produce milk
Why are nails important
Ridges in nails can be associated with thyroid problems
Reticular layer is made of what tissue
Connective
Epidermis is what kind of tissue
Keratinized stratified epithelial
Dermis is made up
Of what tissue
Connective
