Integument Flashcards
(45 cards)
Simple
1 layer
Stratified
2 or more layers
Pseudostratified
Looks like many layers but only one
Squamous
Pancake
Cuboidal
Cube
Columnar
Talk column
Keratinocyte
Filled with keratin
Layers reflect 25-45 day life cycle
Cell dies as it moves away from blood supply
Eumelanin
Brown or black
Pheomelanin
Yellow or red
Melanocytes absorb and protect the body from
UV
Why does some UV have to be absorbed
Must reach precursor to make vitamin D for calcium
Melanosomes
Package melanin
Unipotent
Stem cells make one cell
Pleuripotent
Stem cells make any cell
Niche
Group of stem cells
Thick skin
5 layers
What layer does thin skin not have
Lucidum
Bottom layer of epidermis and cells in it
Basal layer
Melanocytes, langerhans, stem cells, keratinocytes
Single cell thick
Second layer of epidermis
Spiny layer
Langerhans cells= immune cells
Prekeratin fibers
Several layerw
Third layer
Granular layer
3-5 cells
Lamellated granules
Cells begin to die
Fourth layer
Lucidum
Translucent
2-3 cells
Top layer
Corneum
20-30 layers of dead cells
Top layer of the dermis
Papillary layer
Touch and pain receptors
Bottom layer or dermis
Reticular
Collagen