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Desmosomes

Desmosomes. Give spiny appearance to the stratum spinosum Attach neighboring keratinocytes. Melanocytes. Found in the stratum basalis Provide UV protection Synthesize Melanin, which can be distributed to surrounding keratinocytes. Question 1.

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Desmosomes

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  1. Desmosomes • Give spiny appearance to the stratum spinosum • Attach neighboring keratinocytes

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

  3. 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

  4. Dermis: Papillary Layer • Dermal papillae project into epidermis • Meissner’s Corpuscles for 2 point discrimination • Hair follicle bulbs (not pictured)

  5. Hair Follicle • matrix of hair follicle is equivalent to the basal layer of epidermis • sebaceous glandssecrete sebum between shaft and follicle • arrector pili (smooth muscle bundle) cause Goosebumps

  6. Dermis: Reticular Layer Pacinian Corpuscle • found in deeper dermis and hypodermis • senses vibration, deep pressure

  7. 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

  8. Question 2

  9. 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

  10. Take Home Point: Some people have thicker skin than others! Good Luck and may your epidermis protect you!!!! Naked Cowboy—see him for yourself in Times Square!

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