Integument Flashcards
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
Hypodermis is made of
Adipose fissure or fat
Most common protein in body
Collagen
Most common skin cancer and percent
Basal cell carcinoma 80%
Squamous cell carcinoma
20% of all skin cancers
In spiny layer
More aggressive because of angiogenesis
Melanoma
1% of skin cancers but 90% of deaths in skin cancer
Melanocytes grow out of control and met to blood and lymph
ABCDE
Asymmetry border irregularities color diameter elevation
What burn is epidermis only
First
2nd degree burn
Blistering in epidermis and upper dermis
Why is 3rd degree so dangerous
Dehydration and electrolyte loss which messes up cardiac rhythm> cardiac arrest
Bacterial infection easily turns into sepsis
Rule of 9s
Head 4.5
Arms 4.5
Legs 9
Torso 18
What percent is critical in 2nd degree
25%
What percent is critical in 3rd degree
10%
Eccrine glands are under the control of
Sympathetic nervous system
Where are eccrine glands and purpose
All over body
Regulate temp
Release waste
Apocrine glands are under the control of
Androgens
Where are apocrine glands and when do they start
Armpits & genitalia
Puberty
Acinar gland shape
Berry
What do acinar glands make and what are they under the control of
Sebum, androgens
Vellus hair
Fine peach fuzz
Terminal hair
Thick on head
Hair anatomy from inside out
Medulla, cortex, cuticle
