Transcript Integumentary System Outline

Integumentary System Outline
Health Occ
Integumentary System
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Composed of
Skin
 Accessory structures
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Accessory structures include
hair
 Nails
 Glands
 nerves
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Integumentary System
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Main Functions
Cover and protect the body
 Help regulate the body’s temperature
 Excretes some of the body’s waste
materials
 Includes sensors for pain and sensation
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Skin
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Functions
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Protects the body from injury
protects the body from the intrusion of
harmful microorganisms
Protects the body from the ultraviolet (UV)
rays of the sun
helps to maintain proper internal
temperature of the body
Serves as a site for excretion of waste
through perspiration
serves as an important sensory organ
Skin
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Covers
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17 to 20 square feet
Variations of Thickness
1/50 inch to ¼ inch thick
 The skin on the back upper back is 10 times
thicker than the skin on the eyelid
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Skin
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Layers of the skin and what they are
composed of
Epidermis
 Dermis
 Subcutaneous
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Epidermis
Outer layer of skin
 2 sub layers: stratum corneum, stratum
germinativum
 Dead skin cells, melanin, 90% water
repellant
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Dermis
Makes ridges known as fingerprints
 Blood vessels, nerve endings,
sebaceous and sweat glands, hair
follicles
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Subcutaneous
Fatty and fibrous tissue, blood vessels
and nerves
 Fatty layer protects inner organs and
maintains body temp.
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Hair
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Pilus
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Where you do/don’t have hair
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Hair
All areas except soles of feet and palms
Visible Portion
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shaft
Hair
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The root
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Oil glands
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Attached to each hair
Melanin
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follicle
Determines hair color
No melanin = gray hair
Baldness (alopecia)
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Heredity, result of disease, injury, or medical treatment
Glands
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Three types of glands
Sebaceous
 Sudoriferous
 ceruminous
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Sebaceous
Dermis, base of hair follicles
 Secrete sebum
 Lubricates, softens, and protects skin
from bacteria and fungi
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Sudoriferous (sweat glands)
Found almost everywhere
 Cools the body
 Diaphoresis = sweating
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Ceruminous
Found in the auditory canal of ear
 Secrete wax
 Protects ear from infection
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Nails
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Function
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Formed from
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Protection
Help with grasping
objects
Allow us to scratch
Hard keratin
Lunula
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Crescent shaped
white area