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integumentary system

Terms in this set (31)

Meissner's corpuscles
fine touch,. are located in the dermal papillae.
Pacinian corpuscles
vibration and pressure
naked nerve endings
pain, hot, cold
nerve fibers
assoc. w hair
mechanoreceptors of integument (4)
Meissner's corpuscles, Pacinian corpuscles, naked nerve endings, nerve fibers
Epidermis
Stratified, squamous epithelium with keratin
Dermis (papillary, reticular)
The Dermis = connective tissue & accessory structures
Is located between epidermis and subcutaneous (hypodermal) layer
Anchors epidermal accessory structures (hair follicles, sweat glands)
Has two components
Outer papillary layer
Loose, areolar connective tissue
smaller capillaries, lymphatics, and sensory receptors
Forms dermal papillae projecting between epidermal ridges
Deep reticular layer
Dense irregular connective tissue
larger blood vessels, lymph vessels, and nerve fibers
Collagen fibers and bundles and elastic fibers
Contains cells commonly found in the connective tissue proper
Hypodermis
or subcutaneous layer or (superficial fascia -- subcutaneous)
loose connective tissue with adipose cells below the dermis
location of hypodermic needle injections
Keratinocyte
All skin cells are called keratinocytes
Thin Skin
Covers most of the body
Has three layers of keratinocytes (thick as a plastic sandwich bag)
Thick Skin
Covers the palms of the hands and soles of the feet
Has three layers of keratinocytes (paper towel thickness)
More keratin
stratum corneum
located at the exposed surface of both thick and thin skin
stratum lucidum
the stratum that appears "clear"
Stratum Granulosum
contains abundant keratohyaline granules
Stratum Spinosum
contains many prominent desmosomes
Stratum germinativum (basale)
innermost (deepest) epidermal layer involved in mitotic activity
1) surface
2) stratum corneum
3) stratum lucidum
4) stratum granulosm
5) stratum spinosum
6) stratum germinativum (basale)
7) basal lamina
8) dermis
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