Final Flashcards
From deepest to superficial list the layers of the epidermis
Stratum basale Stratum spinosum Stratum granulosum Stratum lucidum (only in thick skin) Stratum corneum
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Ch. 8 Obj. 2
As cells are pushed superficially, they lose their nucleus and organelles and become dead bags of keratin
Corneocytes
Ch. 8 Obj. 2
When corneocytes are constantly shed from the surface of the stratum corneum the shed flakes are
Squames
Ch. 8 Obj. 2
Cells divide and grow in basale, then migrate upwards, losing their nuclei and becoming bags of keratin
Keratinocytes
Ch. 8 Obj. 2
Layers of epidermis:
“Horn-like”
Corneum
Ch. 8 Obj. 2
Layers of epidermis:
“Clear”
Lucidum
Ch. 8 Obj. 2
Layers of epidermis:
“Grainy”
Granulosum
Ch. 8 Obj. 2
Layers of epidermis:
“Spiny”
Spinosum
Ch. 8 Obj. 2
Layers of epidermis:
• layer from which all other regenerate
Basale
Ch. 8 Obj. 2
The skin is what kind of epithelium
Stratified squamous
Ch. 8 Obj. 2
A cell membrane surrounding the protein keratin and make up 90% of the cells of epidermis
Keratinocyte
Ch. 8 Obj. 4
Cells which produce and carry pigment granules that give the skin it’s color…about 8% of cells
Melanocytes
Ch. 8 Obj. 4
Cells which is the skin’s version of a type of immune cell(dendritic cell) - phagocytes
Langerhans cells
Ch. 8 Obj. 4
Light touch receptors
Merkel discs
Ch. 8 Obj. 4
_____ and ____ of the skin help make a waterproof deal between the moist tissues below and the dry outside world
Keratin and lipids
Ch. 8 Obj. 4
What vitamin has to do with skin
Vitamin D
Ch. 8 Obj. 4
____ cells found in stratum basale
- full of intermediate filament protein keratin a
- divide to regenerate skin keratinocytes
- cells terminally differentiate as they move more superficially
- eventually lose their nuclei and become just keratin surrounded by a membrane
- secrete lipids that give skin waterproof and flexible properties
Stem cells
Ch. 8 Obj. 4
A connective tissue layer beneath the epidermis
Dermis
Ch. 8 Obj. 6
Two regions of the dermis
Papillary and reticular
Ch. 8 Obj. 6
Region about 1/5 of the thickness of the dermis. Ridges that penetrate into epidermis and contain blood vessels and meissner corpuscles(sensory structures)
Papillary region
Ch. 8 Obj. 6
4/5 of the dermis and the nerves and blood vessels run through this dermis region. Also hair roots and glands are found here.
Reticular region
Ch. 8 Obj. 6
What kind of tissue is the dermis
Dense connective
Ch. 8 Obj. 6