A&P Test 2 (1)

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  1. The superficial thinner layer of the skin, composed of keratinized stratified squamos epithelium.
  2. Four types of cells
    Keratinocytes, melanocytes, intraepidermal macrophages, tactile epithelial cells
  3. Arranged in four or five layers and produce the protein
  4. A tough fibrous protein that provides protection of the skin and under lying tissue from abrasions, heat, microbes and chemicals
  5. Produce the pigment melanin
  6. a yellow-red or brown black pigment that contributes to skin color and absorbs damaging UV light
  7. Arise from red bone marrow and migrate to the epidermis,where they constitute a small fraction of the epidermal cells; Involved in the immune responses
    Intraepidermal macrophages
  8. Located in the deepest layer of the epidermis, where they contact the flattened process of a sensory neuron; Function in the sensation of touch
    Tactile epithelial cells
  9. Layers of the epidermis (thick skin)
    stratum basale, stratum spinosum, stratum granulosum, stratum lucidum, stratum corneum
  10. Deepest layer of the epidermis, composed of a single row of cuboidal or columnar keratinocytes. Undergoes cell division to continually produce new keratinocytes.
    Stratum basale
  11. Superficial to the stratum basale, mainly consists of numerous keratinocytes arranged in 8-10 layers. Produce coarser bundles of keratin in intermediate flaments than those of the basal layer
    stratum spinosum
  12. Middle of epidermis, consists of three to five layers of flattened keratinocytes that are undergoing apoptisis. The nuclei and other organelles of these cells begin to degenerate as they move farther from their source of nutrition.
    Stratum granulosum
  13. Present only in the thick skin of ares such as fingertips, palms, and soles. Consist of four to six layers of flattened clear dead keratinocytes. Provides an additional level of toughness in this region of thick skin
    Stratum lucidum
  14. Consist on average of 25 to 30 layers of flattened dead keratinocytes. Cells are extremely thin, flat, plasma membrane. Final product of the differentiation process of the keratinocytes.
    Stratum corneum
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A&P Test 2 (1)
2015-10-10 17:37:30
UofM A&P
test 2
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