Epidermis Cell Types and Layer Structure: Key Details for Biology- chp 5
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24 Terms
What are the Cells of the Epidermis?
Keratinocytes, Melanocytes, Dendritic cells, Tactile (Merkel) cells
Keratinocytes
- Produce keratin
- Tight junctions and desmosomes
Dendritic cells
Phagocytosis & Key activators of the immune system
Melanocytes
- Produce melanin• Protect from UV damage
Tactile (Merkel) cells
- Light touch receptors- With a sensory nerve ending= tactile disc
Stratum corneum
dead cells filled with keratin
Stratum lucidum
only in think skin
Stratum granulosum
disintegrating cells
Stratum spinosum
living keratinocytes with spiny projections, dendritic cells
stratum basale (germinativum)
stem cells, melanocytes, tactile cells
Dermis
2 layers of connective tissue with accessory structures
What is the correct Layers of the Epidermis?
5. Stratum corneum, 4. Stratum lucidum, 3. Stratum granulosum, 2. Stratum spinosum, Stratum basale (germinativum)
Where are blood vessels housed that nourish the epidermis?
Dermal papillae
What is the main tissue of the epidermis?
Keratinized stratified squamous epithelium
What is the thickest layer of the epidermis?
Stratum spinosum
The majority of cells in the epidermis arise from mitotic activity in stratum
basale
What are the main components of the cutaneous membrane?
Epidermis and dermis
Which of the following are components or features typically found within the dermis layer of the skin?
Sweat glands,
Hair follicles,
Papillary layer
Which of the following cells are associated with the dermis?
Fibroblasts
Why do keratinocytes in the superficial strata of the epidermis die?
They are too far away from the blood supply in the dermis.
The most superficial component of the skin is the
Epidermis
Where are blood vessels housed that nourish the epidermis?
Dermal papillae
The most superficial layer of the dermis is the
papillary layer
From superficial to deep, what is the correct order of the layers of the epidermis in thick skin?
Stratum corneum, stratum lucidum, stratum granulosum, stratum spinosum, and stratum basale