Skin, Hair and Nails

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Skin, Hair and Nails
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Skin

• 2 Layers of Skin
• Outer Epidermis
• Inner supportive Dermis
• 3rd Layer of Subcutaneous Adipose

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Epidermis

• Protective
• Stratified into several zones
• Basal cell layer forms new skin cells
• Keratin major ingrediant
• Melanin but amt of production varies
• Uniformly thin except on palms and soles
• Avascular

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Skin Color

• Melanin
• Carotene pigment
• Vascular beds in the dermis
• Affected by skin thickness edema

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Dermis

• Supportive layer
• Collagen
• Elastic quality for stretching
• Nerves, sensory receptors, bld. vessels, lymphs
• Epidermis appendages hair follicles, sebacceous
  glands, sweat glands embedded in the dermis

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Hair

• Important because?
• Threads of keratin
• 2 types
• Vellus hair- over body
• Terminal hair

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Glands

• Sebaceous Glands
• Sebum protective lipid substance
• Lubricates hair skin
• prevents water loss
• everywhere but palms soles
• Sweat Glands
• Eccrine skin surface- sweat
• Apocrine thick, milky secretion axilla,
  anogenital, nipples, navel.

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Nails

• Keratin
• Color
• Condition
• Shape, Profile sign

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Function of Skin

• Protection
• Prevents penetration
• Perception
• Temperature regulation
• Identification
• Communication
• Wound repair

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Function of Skin

• Absorption excretion
• Vitamin D ultraviolet light gt cholesterol