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Aging of the Skin
Fundamentals 2
11
Medical
Kindergarten
04/24/2011

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Cards

Term
functions of the skin
Definition
protection; temperature homeostasis; excretion; synthesis; non-verbal communication
Term
layers of the skin
Definition
epidermis, dermis, hypodermis
Term
epidermis
Definition
stratified squamous; subdivided into 5 layers (corneum, lucidum, granulosum, spinosum, basale) replaces itself every 35-45 days; cells of epidermis: stem cells, keratinocytes, melanocytes, Merkel cells, Langerhans cells (immune cells)
Term
dermis
Definition
strong, flexible connective tissue; collagen, elastic, and reticular fibers; rich in nerves, vessels, and receptors; hair follicles and sweat glands
Term
hypodermis
Definition
mainly fatty tissue; good insulator; infants and elderly have less making them more sensitive to cold
Term
hair covers entire body except:
Definition
palms, soles, nipples, and parts of external genitalia
Term
humans are born with as many ______ as they will ever have.
Definition
follicles
Term
hair is the _____ growing cells in the body
Definition
fastest
Term
what are the 4 types of skin glands?
Definition
sebaceous glands (hair follicles), sweat glands (eccrine: cover entire body; apocrine: genitals and armpits) mammary, ceruminous
Term
natural skin aging:
Definition
occurs over time in everyone; atrophy of dermal tissues and vascularity; decreased protein protection; shrinkage of sebaceous glands (dryness); fine lines, benign growths, dryness
Term
photoaging effects:
Definition
from UV light; causes hyperplasia (increase in production/number of cells) and hypertrophy (increase is size of cell); deterioration of collagen and elastin; atypical cells in the basal layer and melanocytes (abnormal pigmentation); dilated blood vessels (telangiectasia) actinic changes (dysplasia); skin cancers
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