Esthetician Anatomy the Hair Essay

690 Words Nov 3rd, 2012 3 Pages
THE HAIR
HAIR
* NO SENSATION OR FEELING IN THE HAIR SHAFT DUE TO NERVE STIMULI * COMPOSED OF KERATIN (PROTEIN)

HAIR GROWS EVERYWHERE EXCEPT * SOLES OF FEET * PALMS OF HANDS * SOME AREAS OF GENITALS * MUCOUS MEMBRANE OF LIPS * NIPPLES (NOT INCLUDING AREOLA) * NAVAL

AREAS WITH THE HEAVIEST CONCENTRATION OF HAIR * SCALP * AXILLARY REGION * ARMS * LEGS * ON & AROUND GENITALS

*FUNCTIONS OF THE HAIR* PROTECTION * PROVIDES LITTLE PROTECTION IN HUMANS * PREVENTS THE ENTRY OF GERMS * THICK AND LONG SCALP HAIR HELP AS HEAT REGULATOR SENSORY RECEPTION
HAIR FOLLICLES ARE SURROUNDED BY SENSORY NERVES RESPOND TO PRESSURE ON THE SHAFT

FACTORS INFLUENCING HAIR
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OUTER ROOT SHEATH * ALLOWS RENEWAL DEVELOPMENT OF THE HAIR CELLS TO TAKE PLACE * DOWNWARD CONTINUATION OF EPIDERMIS

B. INNER ROOT SHEATH
- CELLS INTERLINK WITH HAIR CELLS HELPING TO SECURE HAIR WITHIN FOLLICLE

4. GERMINAL MATRIX - LIVING & REPRODUCING PART OF BOTH HAIR & NAILS - ALSO KNOWN AS “THE HAIR MATRIX”

5. HAIR PAPILLA - SMALL CONE SHAPED ELEVATION AT THE BOTTOM OF THE HAIR FOLLICLE - HOUSES BLOOD SUPPLY - NOURISHMENT FOR THE MATRIX - NUTRIENTS FROM GI TRACT & RESPIRATORY SYSTEM FEEDS THE CELL FOR GROWTH & DEVELOPMENT - HORMONES FROM THE ENDOCRINE SYSTEM DETERMINES PATTERN OF HAIR GROWTH

6. HAIR ROOT -DEEP TO THE SURFACE THAT PENETRATES TO DERMIS -CONTAINS MATRIX -CELLS IN THE MATRIX REPRODUCE NEW CELLS BY MITOSIS

7. HAIR BULB -INFERIOR & SWOLLEN PART OF THE ROOT -LOCATED AT THE BASE OF HAIR FOLLICLE WHERE NEW HAIR DEVELOPS

8. ARRECTOR PILI (PLURAL)
-INVOLUNTARY MUSCLE FIBRE IN THE SKIN ATTACHES TO BASE OF HAIR FOLLICLE
-COLD OR FRIGHT CAUSES CONTRACTION OF THE MUSCLE WHICH PULLS THE HAIR

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