Skin, Hair and Nails - PowerPoint PPT Presentation

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Skin, Hair and Nails

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Threads of keratin 2 types Vellus hair- over body Terminal hair Glands Sebaceous Glands Sebum = protective lipid substance Lubricates hair& skin prevents water ... – PowerPoint PPT presentation

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Title: Skin, Hair and Nails


1
Skin, Hair and Nails
2
Skin
  • 2 Layers of Skin
  • Outer Epidermis
  • Inner supportive Dermis
  • 3rd Layer of Subcutaneous Adipose

3
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

14
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

15
Hair
  • Important because?
  • Threads of keratin
  • 2 types
  • Vellus hair- over body
  • Terminal hair

16
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.

17
Nails
  • Keratin
  • Color
  • Condition
  • Shape, Profile sign

18
Function of Skin
  • Protection
  • Prevents penetration
  • Perception
  • Temperature regulation
  • Identification
  • Communication
  • Wound repair

19
Function of Skin
  • Absorption excretion
  • Vitamin D ultraviolet light gt cholesterol
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