Integumentary System

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Integumentary System

• Weve got you covered.

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Functions

• Protection
• Excretion
• Body temperature
• Cutaneous sensation
• Vitamin D synthesis
• Blood reservoir

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Epidermis

• 5 layers
• Outer layer-20-30 cells thick, dead cells
• Innermost layer-Basal layer
• Growing layer- single layer columnar cells
• melanocytes

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Dermis

• Mainly connective tissue
• Blood vessels, nerves, oil and sweat glands

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Skin Color

• 3 pigments
• Melanin- brown-yellow
• Carotene- yellow-orange
• Hemoglobin- (red blood cells) red

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Accessory organs

• Hair
• Flexible
• Produced by hair follicle

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Nails

• Dead cells of keratin
• Protects tips of fingers and toes

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Sweat Glands (sudoiferous)

• 2.5 million
• Rids body of excess water and other wastes
• Evaporates to cool body

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Sebaceous glands (oil)

• Secrete sebum (oil)
• Reaches surface where hair emerges
• Prevents hair and skin from drying out
  waterproofs skin

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Disorders of Skin

• Acne
• Occurs when oil mixes with dead cells and plugs
  up pores in the skin
• Inflammation of oil glands
• Hormones

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Skin Disorders

• Small pox
• Necrosis
• Psoriasis
• Contact dermatitis
• Androgenic alopecia
• Albinism
• Jaundice
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Burns

• 1st degree
• Redness, epidermis is burned
• 2nd degree
• Partial-thickness
• Epidermis and upper portion of dermis
• 3rd degree
• Full-thickness
• Entire epidermis and dermis

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Cancer

• Basal cell carcinoma
• Squamous cell carcinoma
• Malignant melanoma

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