the skin or integumentary system remember the outer portion of the skin is an example of what type...
TRANSCRIPT
THE SKIN OR INTEGUMENTARY SYSTEM
Remember the outer portion of the skin is an example of what type of
tissue?
Epithelia Tissue
FUNCTIONS OF THE SKIN
• PROTECTION• THERMOREGULATION
• CUTANEOUS SENSATION• PRODUCTION OF VITAMIN D
• BLOOD RESERVOIR• EXCRETION
LAYERS OF THE SKIN
EPIDERMIS
DERMIS
HYPODERMIS
EPIDERMIS
• THICK• KERATINIZED
• STRATIFIED SQUAMOUS EPITHELIUM• 4-5 SUBLAYERS
LAYERS OF THE EPIDERMIS
• STRATUM BASALE• STRATUM SPINOSUM
• STRATUM GRANULOSUM• STRATUM LUCIDUM• STRATUM CORNEUM
STRATUM BASALE
• THE DEEPEST EPIDERMAL LAYER• A SINGLE ROW OF LIVING CELLS
• RAPID CELL DIVISION• 10-25% OF THESE CELLS ARE
MELANOCYTES
STRATUM BASALE
STRATUM SPINOSUM
• SEVERAL LAYERS OF LIVING CELLS
• CELL DIVISION IS SLOWER THAN BASALE
STRATUM SPINOSUM
STRATUM GRANULOSUM
• THIN, LIVING LAYER OF CELLS
• KERATINOCYTES WATERPROOF IN THIS LAYER
STRATUM GRANULOSUM
STRATUM LUCIDUM
• DEAD CELLS
• LOCATED ONLY IN THICK SKIN (PALMS OF HANDS & SOLES OF FEET)
STRATUM LUCIDUM
STRATUM CORNEUM
• DEAD CELLS
• SERVES TO PROTECT
STRATUM CORNEUM
THE DERMIS
HAIR FOLLICLES, OIL & SWEAT GLANDS ARE FOUND HERE
EPIDERMIS
DERMIS
HAIR & ITS FUNCTIONS
• WARMTH; IT PREVENTS HEAT LOSS
• DETECT INSECTS ON THE SKIN
• PROTECTION
• FILTER PARTICLES
FACTS ABOUT HAIR
• ABOUT 100,000 IN THE SCALP
• ABOUT 30, 000 IN A MAN’S BEARD
• RATE OF HAIR GROWTH AVERAGES 2 mm/WEEK
• HAIR LOSS AVERAGES 90 HAIRS/DAY
HAIR LOSS• ALOPECIA: HAIR THINNING AND BALDNESS
CAUSES OF HAIR LOSS
• HIGH FEVER• SURGERY
• SEVERE EMOTIONAL TRAUMA• CERTAIN DRUGS
• EXCESSIVE VITAMIN A• CHEMOTHERAPY DRUGS
• RADIATION• GENETICS
MOST IMPORTANT
• POOR NUTRITION (ESPECIALLY LACK OF ENOUGH PROTEIN)
• HORMONAL IMBALANCES