Transcript 4.3 Hair, Nails, & Burns

Hair, Nails, &
Burns
Mrs. Halkuff:
Anatomy & Physiology

Hair Structure
Hair Bulb
 Root
 Medulla: inner
central core
 Cortex: surrounds
medulla
 Shaft: projects from
the skin
 Cuticle: outermost
layer; covers cortex)
Arrector Pili: Muscle
that is attached to
hair follicle
(goosebumps)
Hair Types

Wavy Hair: Hair
shaft is OVAL
 Curly/Kinky Hair:
Hair shaft is FLAT or
RIBBON-LIKE
 Straight Hair: Hair
shaft is perfectly
ROUND
Nail Structure

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Free Edge
Nail Plate (top)
Nail Bed (underside)
Lunula
Nail Fold (Cuticle)
Nail Matrix
Skin Infections

Athletes Foot:
Fungus infection on
the feet.

Boils: Inflammation
of hair follicles

Cold Sores: Fluidfilled blisters usually
around the nose or
mouth.

Contact
Dermatitis: Itching
redness, & swelling
due to an allergy.
 Impetigo: Pink,
water-filled lesions
around mouth &
nose.
 Psoriasis:
Reddened
epidermal lesions
covered with dry
silvery scales
Burns

Rule of Nines: Divides
the body into 11 areas
each accounting for 9%
of total body surface.

Head = 9%
Chest and abdomen = 18%
Upper/mid/low back and buttocks =
18%
Each arm = 9%
Groin = 1%
Each leg = 18%
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As an example, if both legs (18% x
2 = 36%), the groin (1%), and
the chest and abdomen (18%)
were burned, this would involve
55% of the body.
Burns

Burns are serious because victims lose
fluids and this affects all body systems.
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Skin is sterile for 24 hours after a
severe burn, but after that bacteria and
fungi begin to invade.
st
1

Degree Burns
Only the epidermis
is damaged
 Area is red &
swollen
 Usually heals within
2-3 days
 Ex. Sun burns
nd
2

Degree Burn
Involves injury to the
epidermis & upper
dermis region
 Skin is red with
painful blisters
 Regeneration of the
epithelium can occur
 Usually no
permanent damage
rd
3

Degree Burn
Destroys the entire
thickness of skin
 Burned area
appears blanched
(gray/white)
 Not painful b/c nerve
endings are
destroyed
 Regeneration is not
possible (skin
graphing)