Skin

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Desmosomes

• Give spiny appearance to the stratum spinosum
• Attach neighboring keratinocytes

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Melanocytes

• Found in the stratum basalis
• Provide UV protection
• Synthesize Melanin, which can be distributed to
  surrounding keratinocytes

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Question 1

• In the stratum basalis, ______ are found. They
  attach keratinocytes to ______.
• Hemidesmosomes, basal lamina
• Desmosomes, basal lamina
• Hemidesmosomes, other keratinocytes
• Desmosomes, Langerhans cells

Lab 8, slide 2
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Dermis Papillary Layer

• Dermal papillae project into epidermis
• Meissners Corpuscles for 2 point discrimination
• Hair follicle bulbs (not pictured)

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Hair Follicle

• matrix of hair follicle is equivalent to the
  basal layer of epidermis
• sebaceous glands secrete sebum between shaft and
  follicle
• arrector pili (smooth muscle bundle) cause
  Goosebumps

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Dermis Reticular Layer

• Pacinian Corpuscle
• found in deeper dermis and hypodermis
• senses vibration, deep pressure

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Dermis Reticular Layer

• eccrine sweat glands 
• Secretory tubules acidophilic layer of
  myoepithelium contracts to expel secretion
• Excretory ducts extend to epidermis with TWO
  layers of cuboidal cells
• corkscrew path in epidermis

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Question 2
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Question 3

• The structure is a(n) _______ it is located in
  the _______layer, and its ducts terminate in the
  _______.
• sebaceous gland, hypodermal, stratum granulosum.
• eccrine sweat gland, dermal, stratum granulosum.
• eccrine sweat gland, dermal, stratum corneum.
• sebaceous gland, hypodermal, stratum corneum.

Lab 8, slide 14
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Take Home Point Some people have thicker skin
than others!
Good Luck and may your epidermis protect you!!!!
Naked Cowboysee him for yourself in Times
Square!