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Anatomy Exam 1 > Integument > Flashcards

Flashcards in Integument Deck (17):
1

Integument

a covering or investment that extends over the body surfaces

2

Integument functions

1. Serves as a mechanical barrier, preventing penetration of substances into the body
2. Produces the pigment melanin which protects against UV
3. assists in excretion of metabolic waste products
4. acts as a shock absorber
5. Protects against injuries from impact or friction
6. prevents evaporation of various body fluids
7. assists with thermoregulation
8. serves as an extremely sensitive sensory organ

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Skin

Firmly anchored to the subcutaneous tissue
Comprised of two elements
Outermost Epidermis
and underlying dermis

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Subcutaneous tissue

hypodermis

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Epidermis

Outermost layer of skin
Made of stratified epithelial cells
Epidermal cells are produced continuously through ongoing mitosis that begins in the deepest cells adjacent to the dermis
They migrate toward the surface until they break free of the skin and are shed (ROOM DUST)
NO direct blood supply

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Dermis

Composed of connective tissues
Tattoos involve the injection of ink into the deep dermis

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Stratum Corneum

Outermost later of the epidermis
Made of tough, protective keratinized cells

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Sweat glands

Located deep within the dermis
Include thin sweat duct that extends upward, passing through the epidermis
Opens on skin surface as a sweat pore
Dissipating excess body heat on the surface of stratum corneum

9

Hair

Absent on thick skin found of palms and soles

10

Hair follicle

Deep end of the hair shaft is expanded
nourished by blood vessels present in superficial fascia

11

Sebaceous Glands

Oil-production for the hair shaft

12

Arrector pili muscles

Strands of smooth muscle
Tug on the hair shaft to produce goose bumps

13

Sensory nerve fibers

Extend to the dermal-epidermal junction
Responsive to pain, touch and temperature changes

14

Pacinian Corpuscles

Deep within the dermis
Receptors are sensitive to deep pressure and vibration

15

Adipose tissue

Abundant insulation in the subcutaneous tissue
Serves to store energy and acts as a shock absorber

16

Stratified Epithelial Cells

Have no direct blood supply
Oxygen and nutrients are from diffusion from the dermis

17

Skin Cancer

Most common type of cancer
Preventable to a large extent by sunscreens and protective clothing