INTEGUMENTARY SYSTEM

FUNCTION• PROTECTION• SEPARATES THE BODY FROM THE

EXTERNAL ENVIRONMENT

LAYERS• EPIDERMIS• DERMIS

LAYERS OF THE EPIDERMIS• STRATUM CORNEUM• OUTERMOST LAYER• CONSISTS OF MANY LAYERS OF DEAD

CELLS• CONTAINS KERATIN – WATERPROOF

AND PREVENTS EVAPORATION OF BODY’S WATER

• BARRIER TO PATHOGENS

LAYERS OF THE EPIDERMIS• STRATUM GERMINATIVUM• INNER LAYER • WHERE MITOSIS TAKES PLACE• CONTAINS THE CELLS THAT PRODUCE

KERATIN• CONTAIN MELANOCYTES• MELANIN AND VIT D PRODUCTION IS

INCREASED BY EXPOSURE TO UV RAYS

DID YOU KNOW…• EVERY MINUTE 30,000-40,000 DEAD

SKIN CELLS FALL OFF OR ARE SLOUGHED OFF YOUR BODY!!!!!!!! WOW!!!!!!!

• AN ALL NEW YOU EVERY MONTH!

WITHIN THE EPIDERMIS• LANGERHANS CELLS – PHAGOCYTIZE

FOREIGN MATERIAL

DID YOU KNOW…• AN ADULT WILL HAVE MORE THAN 20

SQUARE FEET OF SKIN

• YOU WILL SHED APPROXIMATELY 40 POUNDS OF SKIN DURING YOUR LIFETIME!!!!!

BETWEEN THE EPIDERMIS AND DERMIS

• PAPILLARY LAYER – ABUNDANT IN CAPILLARIES

• BLISTER – SEPARATION OF THE EPIDERMIS FROM THE DERMIS

• CALLUS – PRESSURE TO AN AREA THAT INCREASES MITOSIS

DERMIS• FIBROBLASTS PRODUCE COLLAGEN

(STRENGTH) AND ELASTIN (ELASTIC)• HAIR FOLLICLES – HAIR ROOT• NAIL FOLLICLES – NAIL ROOT• RECEPTORS – PAIN (FREE NERVE

ENDINGS), OTHER RECEPTORS (ENCAPSULATED)

• GLANDS • BLOOD VESSELS

GLANDS• SEBACEOUS – SEBUM – PREVENTS

DRYING OF THE SKIN AND GROWTH OF BACTERIA

• CERUMINOUS – CERUMEN – KEEPS EARDRUM PLIABLE

• SWEAT GLANDS – APOCRINE (AXILLARY AND GROIN) AND ECCRINE (ALL OVER BODY) FOR MAINTAINING NORMAL BODY TEMPERATURES

BLOOD VESSELS• IN A WARM ENVIRONMENT, VESSELS

DILATE TO BRING EXCESS HEAT TO THE BODY SURFACE

• IN A COLD ENVIRONMENT, VESSELS CONSTRICT TO CONSERVE HEAT

SUBCUTANEOUS TISSUE• AKA SUPERFICIAL FASCIA• FUNCTION IS TO CONNECT THE DERMIS

TO THE UNDERLYING MUSCLE• MADE OF AREOLAR CONNECTIVE TISSUE

(STRENGTH AND PROTECTION) AND ADIPOSE TISSUE (STORES FATS AND NUTRIENTS)

BURNS• FIRST-DEGREE – ONLY SUPERFICIAL

EPIDERMIS IS BURNED, PAINFUL• SECOND-DEGREE – DEEPER LAYERS OF

THE EPIDERMIS ARE AFFECTED, BLISTERED, PAINFUL

• THIRD-DEGREE – EPIDERMIS IS GONE, MAY EXTEND TO DERMIS AND SUBCUTANEOUS TISSUE, NOT PAINFUL SINCE PAIN RECEPTOR SITES ARE BURNED

RULE OF 9’S