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The Integumentary System

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1 The Integumentary System



4 Skin Diagram Draw and color a cross-section diagram of the skin. Label and briefly describe each of the following structures: Epidermis Artery Dermis Vein Subcutaneous fascia Hair follicle Sebaceous gland Hair shaft Sudoriferous gland Arrector pili muscle Nerve Pores

5 Sebaceous (oil) gland Pore Hair Epidermis Sudoriferous (sweat) gland Dermis Nerve Sub-cutaneous fascia Artery Hair follicle Arrector pilli muscle Vein


7 Functions of the Skin Protection - From ultraviolet rays and pathogens
- Holds moisture in Sensory Perception - Pain, pressure, temperature, and touch Body Temperature Regulation - Blood vessels dilate to release heat and constrict to conserve heat - Cool body through evaporation of sweat

8 Storage - Fat, glucose, water, vitamins, and salts Absorption - Some medications Excretion - Salt, excess water, and some wastes eliminated through the sweat Production - Produces Vitamin D

9 Pigmentation Melanin: a brownish-black pigment
Carotene: a yellowish-red pigment * The amounts of these two pigments determine a person’s skin color

10 Abnormal Colors of the Skin
Albino : the absence of pigmentation Erythema : reddish color of skin Jaundice : yellow discoloration of skin

11 Cyanosis : a bluish discoloration of the skin due to a lack of oxygen

12 Skin Eruptions Macules : flat spots on the skin

13 Papules : firm raised areas
Vesicles : fluid-filled sacs or blisters

14 Pustules : pus-filled sacs
Crusts : areas of dried pus and blood (scabs)

15 Wheals : itchy, elevated areas with an irregular shape
Ulcer : a deep loss of skin surface

16 Decubitus Ulcers (Bedsores)
Open sores in the skin and underlying tissues due to pressure over a bony area Cuts off the blood supply and the tissue dies

17 Diseases Acne : an inflammation of the sebaceous glands
- Caused by a blockage of the hair follicles with dirt, cosmetics, excess oil, and/or bacteria

18 Alopecia : baldness; a permanent loss of hair on the scalp

19 Verrucae : rough, hard, elevated, rounded surface forms on the skin - warts
- Caused by a viral infection of the skin

20 Skin Cancers : - Forms that are usually localized – don’t spread to other areas of body Basal cell carcinoma Squamous cell carcinoma

21 Skin Cancers Form that CAN spread to other parts of the body and be fatal Malignant Melanoma

22 Signs of Malignant Melanoma
Asymmetrical in shape Borders of lesion are scalloped or irregular Colors are varied – black, brown, white, red Diameter is larger than a pencil eraser

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