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© 2009 Delmar, Cengage Learning Chapter 5 Integumentary System.

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Presentation on theme: "© 2009 Delmar, Cengage Learning Chapter 5 Integumentary System."— Presentation transcript:

1 © 2009 Delmar, Cengage Learning Chapter 5 Integumentary System

2 © 2009 Delmar, Cengage Learning Integumentary System Skin and its appendages –Hair –Nails –Sebaceous glands –Sweat glands Integumentary means covering 3,000 square inches of surface area

3 © 2009 Delmar, Cengage Learning Animation – Skin Click Here to play Skin animation

4 © 2009 Delmar, Cengage Learning Functions of Skin Covering Regulate body temperature Manufacture Vitamin D Nerve receptors

5 © 2009 Delmar, Cengage Learning Functions of Skin Temporary storage Screen out ultraviolet radiation Special absorptive properties

6 © 2009 Delmar, Cengage Learning Structure of the Skin Epidermis –Outermost covering –Avascular Dermis –True skin –Connective tissue –Vascular

7 © 2009 Delmar, Cengage Learning Structure of the Skin

8 © 2009 Delmar, Cengage Learning Epidermal Cells Keratinocytes Merkel cells Melanocytes Langerhans cells

9 © 2009 Delmar, Cengage Learning Epidermal Layers Stratum germinativum Stratum spinosum Stratum granulosum Stratum lucidum Stratum corneum

10 © 2009 Delmar, Cengage Learning Dermis Also called corium Thicker, inner layer of the skin Many nerve receptors Blood vessels and heat regulation

11 © 2009 Delmar, Cengage Learning Subcutaneous Layer Also called hypodermal layer Lies under dermis Not a true part of the integumentary system Attaches integumentary system to the surface muscles underneath

12 © 2009 Delmar, Cengage Learning Appendages Hair Root shaft Outer cuticle layer Cortex Inner medulla Hair follicle Arrector pili muscle

13 © 2009 Delmar, Cengage Learning Appendages Nails Hard structures covering the dorsal surfaces of the last phalanges of the fingers and toes Nail bed or matrix Diseases and nail color

14 © 2009 Delmar, Cengage Learning Appendages Sweat Glands Also called sudoriferous glands Perspiration 99% water Perspiration is excreted through pores Under the control of the nervous system 500ml water lost per day through skin Ceruminous or wax glands

15 © 2009 Delmar, Cengage Learning Sebaceous Glands Secrete sebum which is thick, oily substance Sebum lubricates the skin, keeping it soft and pliable

16 © 2009 Delmar, Cengage Learning 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

17 © 2009 Delmar, Cengage Learning Aging Becomes more fragile and dry Loss of elasticity Less effective body temperature control Melanocytes decrease Physiological changes can impact self-worth

18 © 2009 Delmar, Cengage Learning Disorders Skin Acne vulgaris –Common and chronic disorder of sebaceous glands Athlete’s foot –Contagious fungal infection Dermatitis –Inflammation of the skin

19 © 2009 Delmar, Cengage Learning Disorders Skin Eczema –Acute or chronic, noncontagious inflammatory skin disease Impetigo –Acute, inflammatory, and contagious skin disease Psoriasis –Chronic inflammatory skin disease (reddish patches covered by silvery-white scales)

20 © 2009 Delmar, Cengage Learning Disorders Skin Ringworm –Highly contagious fungal infection Urticaria (hives) –Intensely itching wheals or welts Boils (carbuncles) –Painful, bacterial infection of the hair follicles or sebaceous glands

21 © 2009 Delmar, Cengage Learning Disorders Skin Rosacea –Common inflammatory disorder (chronic redness and irritation to the face) Herpes –Viral infection which is usually seen as a blister

22 © 2009 Delmar, Cengage Learning Disorders Skin Genital herpes –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

23 © 2009 Delmar, Cengage Learning Disorders Hair and Nails Head lice –Parasitic insects Ingrown nails –Common nail problem

24 © 2009 Delmar, Cengage Learning Disorders Hair and Nails Fungal infections –Infections of the nail Warts –Viral infections that affect the skin surrounding or underneath the nail

25 © 2009 Delmar, Cengage Learning Skin Cancer Basal cell carcinoma Squamous cell carcinoma Malignant melanoma Skin and sun exposure

26 © 2009 Delmar, Cengage Learning Burns Rule of nines First degree burns Second degree burns Third degree burns

27 © 2009 Delmar, Cengage Learning Skin Lesions Pressure ulcer (decubitus ulcers) –Stage I –Stage II –Stage III –Stage IV


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