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Chapter 5 Integumentary System.

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Presentation on theme: "Chapter 5 Integumentary System."— Presentation transcript:

1 Chapter 5 Integumentary System

2 Integumentary System Skin and its appendages
Hair Nails Sebaceous glands Sweat glands Integumentary means covering 3,000 square inches of surface area

3 Functions of Skin Covering Regulate body temperature
Manufacture Vitamin D Nerve receptors

4 Functions of Skin Temporary storage Screen out ultraviolet radiation
Special absorptive properties

5 Structure of the Skin Epidermis Dermis Outermost covering Avascular
Connective tissue Vascular / Receptors

6 Structure of the Skin

7 Epidermal Cells Keratinocytes- gives strength
Merkel cells- sensory touch Melanocytes- protect against UV Langerhans cells- part of immune

8 Epidermal Layers (5) Stratum germinativum Stratum spinosum
Stratum granulosum Stratum lucidum Stratum corneum

9 Dermis Thicker, inner layer of the skin Many nerve receptors
Blood vessels and heat regulation

10 Subcutaneous Layer Lies under dermis
Not a true part of the integumentary system Attaches integumentary system to the surface muscles underneath

11 Different parts of the skin- Hair
Root shaft – part that is showing (pg. 76) Medulla- Inner part Hair follicle-embedded Arrector pili muscle

12 Appendages Nails Hard structures covering Nail bed or matrix
phalanges of the fingers and toes Nail bed or matrix Diseases and nail color

13 Appendages Sweat Glands
Perspiration 99% water Perspiration is excreted through pores Under the control of the nervous system 500ml water lost per day through skin (.5 gal)

14 Sebaceous Glands Secrete sebum which is thick, oily substance
Sebum lubricates the skin, keeping it soft and pliable

15 Microorganisms Intact skin is the best way to protect itself against pathogens Most skin bacteria are associated with hair follicles and sweat glands Handwashing Most effective action to prevent spread of disease 20 seconds for washing hands 2-4 minutes for infectious material

16 Aging Becomes more fragile and dry Loss of elasticity
Less effective body temperature control Melanocytes decrease

17 Disorders Skin Acne vulgaris Athlete’s foot Dermatitis
Common and chronic disorder of sebaceous glands Athlete’s foot Contagious fungal infection Dermatitis Inflammation of the skin

18 Disorders Skin Eczema Impetigo Psoriasis
Acute or chronic, noncontagious inflammatory skin disease Impetigo Acute, inflammatory, and contagious skin disease caused by staph Psoriasis Chronic inflammatory skin disease (reddish patches covered by silvery-white scales)

19 Disorders Skin Ringworm Urticaria (hives) Boils (carbuncles)
Highly contagious fungal infection Urticaria (hives) Intensely itching wheals or welts Boils (carbuncles) Painful, bacterial infection of the hair follicles or sebaceous glands

20 Disorders Skin Rosacea Herpes
Common inflammatory disorder (chronic redness and irritation to the face) Herpes Viral infection which is usually seen as a blister

21 Disorders Skin Genital herpes Shingle (herpes zoster)
Virus which may appear as a blister in the genital area Shingle (herpes zoster) Skin eruption due to a virus infection of the nerve ending

22 Disorders Hair and Nails
Head lice Parasitic insects Ingrown nails Common nail problem

23 Disorders Hair and Nails
Fungal infections Infections of the nail Warts Viral infections that affect the skin surrounding or underneath the nail

24 Skin Cancer Basal cell carcinoma Squamous cell carcinoma
Malignant melanoma Skin and sun exposure

25 Burns Rule of nines First degree burns Second degree burns
Body divided into 11 area; each part is 9% First degree burns Second degree burns Third degree burns

26 Skin Lesions Pressure ulcer (decubitus ulcers) Stage I Stage II
Stage III Stage IV

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