Flashcards in Epidermis Deck (41):
Lies superficial to dermis
Location of stratum basale
How does the stratum basale connect to the dermis?
It's wavy borderline
Thick bundles of intermediate filaments
Deepest layer of epidermis
The dermis is made of what kind of tissue?
Dense connective tissue
How thick is the stratum corneum
20-30 layers thick 3/4 of epidermal thickness
Flattened layer of the epidermis
Most cells are keratinocytes
The epidermis is made out of what tissue?
Stratified squamous epithelium
Cytoplasm is full of granules
What is the Hypodermis tissue made of?
A tissue that isn't technically part of the skin
How does the stratum lucidum form?
Formed from dead cells of the deeper strata
Cells undergo mitosis
Daughter cells are pushed to become the more superficial layers
Cornified or keratinized to prevent water loss
Characteristic of epidermis
Anchors skin to underlying organs
Function of Hypodermis
Clear layer of epidermis
Superficial to stratum basale
Where is the stratum granulosum located
Superficial to stratum spinosum
Where is stratum lucidum located
Thick hairless skin of the palms and soles
Outermost layer of the epidermis
Organelles are deteriorating
What are the shingle like dead cells in the stratum corneum filled with?
The stratum corneum rubs and flakes off slowly and steadily as?
How often does a new epidermis form
25 to 45 days
Outer layer of the skin
As melanin is produced it accumulates in these membrane bound granules
Spider shaped cells
Taken up by keratinocytes
Melanocytes are most common where?
What determines the amount of melanin produced?
Exposure to sunlight
Where melanin is concentrated in one spot
Freckles and moles
Melanin forms a pigment umbrella over superficial nuclei to shield from what?
How does overexposed to uv rays lead to cancer?
Alters the DNA of skin cells
Many people infected with what are more likely to have an eruption
Herpes simplex (cold sore)
Alert the immune system to threats such as bacterial or viral invasion
Epidermal dendritic cells
Associated with sensory nerve endings, serve as touch receptors
Protects deeper tissue from
Synthesizes vitamin d
AIDS in excretion of urea
AIDS in body heat loss or retention