Created by Laura Miller
over 7 years ago
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Question | Answer |
dermatology | study of the skin |
organization of the skin | epidermis dermis hypodermis |
# epidermis layers | 4-5 |
type of tissue in epidermis | Keratinized, stratified squamous epithelium |
cell types in epidermis | keratinocytes malanocytes |
keratinocytes | contain keratin |
keratin | tough protein that protects and waterproofs skin |
malanocytes | produce malanin |
melanin | pigment |
5 layers epidermis (stratum) | corneum lucidum granulosum spinosum basale |
stratum corneum | top layer of epidermis 25-30 layers of dead keratinocytes |
stratum lucidum | ONLY in thick skin areas 3-5 layers of flattened clear, dead keratinocytes |
stratum granulosum | middle layer water repellant sealant keratinocytes start to die here |
stratum spinosum | strength and flexibility |
stratum basale | bottom layer epidermis cells undergo mitosis |
disorders of epidermis | callus psoriasis moles dandruff warts |
callus | abnormal thickening of epidermis |
psoriasis | keratinocytes divide and move too quickly to stratum corneum |
dermis | connective tissue |
regions of dermis | papillary reticular |
papillary(1/3) | superficial dermal papillae ridges(grip) meissners corpuscles - tactile free nerve endings - temp, pain, itch |
reticular region(2/3) | deep layer subcutaneous hair follicles, nerves, oil, swet glands stretch marks(striae) |
structures in reticular region | hair follicles nerves oil glands sweat glands |
composition subcutaneous layer(hypodermis) | aeriolar connective tissue and adipose tissue has blood vessels pacinian coruscles(sense pressure) |
skin color | melanin - produced by melanocytes |
nevus | mole - benign overgrowth of melanocytes |
skin color diagnostics | erythema - redness (injury) cyanosis - bluish (oxygen) jaundice - yellow (liver) pallor - pale (anemia, shock) |
structures found in the skin | hair glands nails |
hair types | lanugo vellus terminal |
function of hair | protection |
structure of hair | hairbulb root follicle - skin sheath shaft - hair arrector pili - muscle |
hair color comes from | melanin |
excessive body hair | hirsutism |
glands of the skin | sebacious sudoriferous ceruminous |
function sebacious glands | oil, hair follicle, dont dry out |
function sudoriferous glands | sweat cool, waste, water |
2 types sudoriferous | merocrine - body temp apocrine - armpit, groin, BO |
ceruminous glands | wax |
structure of nails | nail body nail root eponychium |
eponychium | cuticle |
functions of skin | regulate temp store blood protection sensation excretion water & waste synthesis vitamin D |
3 forms skin cancer | basal cell carcinoma (78%) squamous cell carinoma ( 20%) malignant melanomas (2%) |
basal cell carcinoma | basale layer |
squamous cell carcinoma | upper epidermis |
malignant melanomas | occurs in melanocytes |
skin cancer risks | light skin sun family age immunosuppressed tanning beds |
warning signs of melanoma | Asymmetry Border Color Diamater Evolving |
cause of burns | heat electricity chemicals |
types of burns | 1st 2nd - epidermis & dermis, blister 3rd - all layers |
death from burns | shock, infection |
decubitus ulcers | bed sores pressure blood deficiency |
athletes foot | fungal |
laceration | cut - considered skin dissorderf |
hives | allergic |
eczema | dermatitis rash |
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