Integumentary System Outline

Health Occ

Integumentary System

Composed ofSkin Accessory structures

Accessory structures includehairNailsGlandsnerves

Integumentary System

Main FunctionsCover and protect the bodyHelp regulate the body’s temperatureExcretes some of the body’s waste

materials Includes sensors for pain and sensation

Skin

Functions 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

SkinCovers

17 to 20 square feetVariations of Thickness

1/50 inch to ¼ inch thickThe skin on the back upper back is 10 times

thicker than the skin on the eyelid

Skin

Layers of the skin and what they are composed ofEpidermisDermisSubcutaneous

Epidermis

Outer layer of skin2 sub layers: stratum corneum, stratum

germinativumDead skin cells, melanin, 90% water

repellant

Dermis

Makes ridges known as fingerprintsBlood vessels, nerve endings,

sebaceous and sweat glands, hair follicles

Subcutaneous

Fatty and fibrous tissue, blood vessels and nerves

Fatty layer protects inner organs and maintains body temp.

Hair

PilusHair

Where you do/don’t have hairAll areas except soles of feet and palms

Visible Portionshaft

Hair

The root follicle

Oil glands Attached to each hair

Melanin Determines hair color No melanin = gray hair

Baldness (alopecia) Heredity, result of disease, injury, or medical treatment

Glands

Three types of glandsSebaceousSudoriferousceruminous

Sebaceous

Dermis, base of hair folliclesSecrete sebumLubricates, softens, and protects skin

from bacteria and fungi

Sudoriferous (sweat glands)

Found almost everywhereCools the bodyDiaphoresis = sweating

Ceruminous

Found in the auditory canal of earSecrete waxProtects ear from infection

Nails Function

Protection Help with grasping

objects Allow us to scratch

Formed from Hard keratin

Lunula Crescent shaped

white area