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S KIN AND BODY MEMBRANES. D ERMIS Two layers Papillary layer (upper dermal region) Reticular layer (deepest skin layer)

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Presentation on theme: "S KIN AND BODY MEMBRANES. D ERMIS Two layers Papillary layer (upper dermal region) Reticular layer (deepest skin layer)"— Presentation transcript:

1 S KIN AND BODY MEMBRANES

2 D ERMIS Two layers Papillary layer (upper dermal region) Reticular layer (deepest skin layer)

3 D ERMIS Papillary layer (upper dermal region) Projections called dermal papillae Capillary loops Pain receptors and touch receptors

4 D ERMIS Reticular layer (deepest skin layer) Blood vessels Sweat and oil glands Deep pressure receptors

5 D ERMIS O VERVIEW Collagen fibers give skin its toughness Elastic fibers give skin elasticity Blood vessels play a role in body temperature regulation

6 S KIN A PPENDAGES Glands Hair Hair follicles Nails

7 S EBACEOUS GLANDS Produce oil Keep skin lubricated Kills bacteria Glands are activated at puberty

8 S EBACEOUS GLANDS

9 S WEAT GLANDS Produce sweat Widely distributed in skin Two types Eccrine Open via duct to pore on skin surface Apocrine Ducts empty into hair follicles

10 S WEAT GLANDS

11 H AIR Produced by hair follicle Consists of hard keratinized epithelial cells Melanocytes provide pigment for hair color

12 H AIR Hair follicle- shaft, follicle (root) medulla (inner), cortex (outer), cuticle (cover) Growth- 4 in./year or 2 mm/week

13 H AIR Associated hair structures Hair follicle Arrector pili muscle Sebaceous gland Sweat gland

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17 N AILS Scale-like modifications of the epidermis Heavily keratinized (very hard)

18 N AILS Consists of: free edge Body Root Cuticle Lunula Growth- 0.5 mm/week

19 N AILS

20 Did you know that your fingernails grow much faster than your toe nails? 3-4 times faster!

21 N AILS Related to length of outermost finger bone Blood flow Use-stimulates growth

22 S KIN I NFECTIONS AND A LLERGIES Contact dermatitis Exposures cause allergic reaction Cold sores Caused by virus Impetigo Caused by bacterial infection Psoriasis Cause is unknown Triggered by trauma, infection, stress

23 S KIN I NFECTIONS AND A LLERGIES

24 B URNS Burns Tissue damage and cell death caused by heat, electricity, UV radiation, or chemicals

25 B URNS Associated dangers Dehydration Electrolyte imbalance Circulatory shock

26 R ULE OF N INES Way to determine the extent of burns Body is divided into 11 areas for quick estimation Each area represents about 9% of total body surface area

27 R ULE OF N INES

28 S EVERITY OF B URNS First-degree burns Only epidermis is damaged Skin is red and swollen Second-degree burns Epidermis and upper dermis are damaged Skin is red with blisters Third-degree burns Destroys entire skin layer Burn is gray-white or black

29 S EVERITY OF B URNS

30 C RITICAL B URNS Burns are considered critical if Over 25% of body has second-degree burns Over 10% of the body has third-degree burns There are third-degree burns of the face, hands, or feet


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