Epidermal Derivatives (pg 6)
Epidermal Derivatives (pg 6)
• Accessory structures of the skin include hair,
nails, and glands
Epidermal Derivatives (pg 6)
• Accessory structures of the skin include hair,
nails, and glands
• They are derived from th...
Hair
• Found on nearly all body surfaces
Hair
• Found on nearly all body surfaces
• Made of dead, keratinized epithelial cells. No
blood vessels or nerves
Hair
• Found on nearly all body surfaces
• Made of dead, keratinized epithelial cells. No
blood vessels or nerves
• Consis...
Hair
• Found on nearly all body surfaces
• Made of dead, keratinized epithelial cells. No
blood vessels or nerves
• Consis...
Hair
• Found on nearly all body surfaces
• Made of dead, keratinized epithelial cells. No
blood vessels or nerves
• Consis...
Hair
• Found on nearly all body surfaces
• Made of dead, keratinized epithelial cells. No
blood vessels or nerves
• Consis...
Nails
• Thin plates of stratum corneum that contain a
very hard type of keratin
Nails
• Thin plates of stratum corneum that contain a
very hard type of keratin
• Cover the distal ends of the phalanges
Nails
• Thin plates of stratum corneum that contain a
very hard type of keratin
• Cover the distal ends of the phalanges
•...
Sebaceous glands
• Associated with hair follicles
Sebaceous glands
• Associated with hair follicles
• Sebum (oil) keeps skin and hair soft and
pliable. Also inhibits growth...
Sebaceous glands
• Associated with hair follicles
• Sebum (oil) keeps skin and hair soft and
pliable. Also inhibits growth...
Sweat glands
• Present everywhere except the lips and
nipples. Most numerous on the palms
Sweat glands
• Present everywhere except the lips and
nipples. Most numerous on the palms
• Merocrine sweat glands: widely...
Sweat glands
• Present everywhere except the lips and
nipples. Most numerous on the palms
• Merocrine sweat glands: widely...
Ceruminous Glands
• Modified sweat glands found only in the ear
canal
Ceruminous Glands
• Modified sweat glands found only in the ear
canal
• Produce cerumen (earwax)
Ceruminous Glands
• Modified sweat glands found only in the ear
canal
• Produce cerumen (earwax)
• Repels insects and trap...
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Epidermal derivatives

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Epidermal derivatives

  1. 1. Epidermal Derivatives (pg 6)
  2. 2. Epidermal Derivatives (pg 6) • Accessory structures of the skin include hair, nails, and glands
  3. 3. Epidermal Derivatives (pg 6) • Accessory structures of the skin include hair, nails, and glands • They are derived from the stratum basale of the epidermis and are embedded in the reticular layer of the dermis
  4. 4. Hair • Found on nearly all body surfaces
  5. 5. Hair • Found on nearly all body surfaces • Made of dead, keratinized epithelial cells. No blood vessels or nerves
  6. 6. Hair • Found on nearly all body surfaces • Made of dead, keratinized epithelial cells. No blood vessels or nerves • Consists of a shaft (portion above scalp) and a root (portion below scalp)
  7. 7. Hair • Found on nearly all body surfaces • Made of dead, keratinized epithelial cells. No blood vessels or nerves • Consists of a shaft (portion above scalp) and a root (portion below scalp) • Root is surrounded by the hair follicle, which contains stratum basale cells that divide to produce the hair
  8. 8. Hair • Found on nearly all body surfaces • Made of dead, keratinized epithelial cells. No blood vessels or nerves • Consists of a shaft (portion above scalp) and a root (portion below scalp) • Root is surrounded by the hair follicle, which contains stratum basale cells that divide to produce the hair • Hair color is determined by the type of melanin produced (yellow, red, brown, or black). With age, melanocytes become less active and melanin is replaced with air bubbles, which appear white
  9. 9. Hair • Found on nearly all body surfaces • Made of dead, keratinized epithelial cells. No blood vessels or nerves • Consists of a shaft (portion above scalp) and a root (portion below scalp) • Root is surrounded by the hair follicle, which contains stratum basale cells that divide to produce the hair • Hair color is determined by the type of melanin produced (yellow, red, brown, or black). With age, melanocytes become less active and melanin is replaced with air bubbles, which appear white • If shaft is round, hair is straight. If oval, wavy. If flat, curly.
  10. 10. Nails • Thin plates of stratum corneum that contain a very hard type of keratin
  11. 11. Nails • Thin plates of stratum corneum that contain a very hard type of keratin • Cover the distal ends of the phalanges
  12. 12. Nails • Thin plates of stratum corneum that contain a very hard type of keratin • Cover the distal ends of the phalanges • Stratum basale grows under the nail to form the nail bed. Thickened at the proximal end to form the matrix, which is responsible for nail growth. Whitish, crescent shaped region of nail above the matrix is called the lunula
  13. 13. Sebaceous glands • Associated with hair follicles
  14. 14. Sebaceous glands • Associated with hair follicles • Sebum (oil) keeps skin and hair soft and pliable. Also inhibits growth of bacteria on skin
  15. 15. Sebaceous glands • Associated with hair follicles • Sebum (oil) keeps skin and hair soft and pliable. Also inhibits growth of bacteria on skin • Stimulated by sex hormones, so become highly active during puberty
  16. 16. Sweat glands • Present everywhere except the lips and nipples. Most numerous on the palms
  17. 17. Sweat glands • Present everywhere except the lips and nipples. Most numerous on the palms • Merocrine sweat glands: widely distributed. Secrete water and salts onto the surface of the skin to decrease body temperature
  18. 18. Sweat glands • Present everywhere except the lips and nipples. Most numerous on the palms • Merocrine sweat glands: widely distributed. Secrete water and salts onto the surface of the skin to decrease body temperature • Apocrine sweat glands: present only on axillae (armpits) and genitalia. Secretions contain fatty acids and proteins, which are quickly broken down by bacteria and cause body odor
  19. 19. Ceruminous Glands • Modified sweat glands found only in the ear canal
  20. 20. Ceruminous Glands • Modified sweat glands found only in the ear canal • Produce cerumen (earwax)
  21. 21. Ceruminous Glands • Modified sweat glands found only in the ear canal • Produce cerumen (earwax) • Repels insects and traps foreign material
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