Class 5: The Skin Flashcards
(61 cards)
Integumentary System consists of
hair, nails, and cutaneous glands
Skin is the most…
vulnerable organ
Skin is the body’s largest and heaviest…
organ
hypodermis is a
connective tissue layer below the dermis
Functions of skin
- resist trauma and infection
- synthesize vitamin D
- sensation
- thermoregulation
- transdermal absorbtion
Epidermis is composed of
keratinized stratified squamous epithelium
The epidermal water barrier is…
Critical to retaining water in the body and preventing dehydration. Makes us waterproof.
Cells above the water barrier quickly…
die
5 types of cells of the epidermis are (deepest to most superficial)
- stem cells
- keratinocytes
- melanocytes
- tactile (merkel) cells
- dendritic (langerhans) cells
Outer layers of epidermis to inner
- Stratum Corneum
- Stratum Lucidum
- Stratum Granulosum
- Stratum Spinosum
- Stratum Basale
How many days does it take for a keratinocyte to make its way to the skin surface and flake off?
30-40 days
Dermis location, type of tissue
connective tissue layer beneath the epidermis
Dermis is composed of mainly
- collagen with elastic fibers
- reticular fibers
- fibroblasts
The Dermis is well supplied with
blood vessels, sweat glands, sebaceous glands, and nerve endings
what is rooted in the dermis?
hair follicles and nail roots
what type of muscle is associate with hair follicles?
smooth muscle (piloerector muscles)
Hypodermis is what type of tissue?
subcutaneous
Hypodermis functions
- Pads the body
- binds the skin to underlying tissues
- absorbs injected drugs
- contains subcutaneous fat
melanin affects
skin color
people of different skin color have the same or different number of melanocytes?
same
Melanin amount varies with exposure to
UV rays of sunlight
Blueness of the skin is called
cyanosis
redness of the skin is called
erythema
pale or ashen skin is called
pallor
