Integumentary System Flashcards
What does the Integumentary system consist of
Composed of skin, hair, nails, glands & nerves
How many hairs are in one square inch of skin?
65 hairs
What are the 6 functions of the skin?
PHASES
Protection
Heat regulation
Absorption
Sensation
Excretion
Secretion
What is TEWL?
trans epidermal water loss - oil helps maintain the water levels in cells by coating the skins surface to slow down water evaporation
What do sensory nerve endings in the dermis respond to?
touch, cold, pain, heat, and pressure
What is the Epidermis?
Outermost layer of the skin
What are the 5 layers of the epidermis?
Stratum Corneum (Horny layer)
Stratum Lucidum (Liquid/clear layer)
Stratum Granulosum (Granular layer)
Stratum Spinosum (Spiny layer)
Stratum Germinativum (Basal cell layer)
What’s the Stratum Corneum?
First layer of the Epidermis
Horny layer
Outermost layer
Made up entirely of dead skin cells
Desquamation: cell turnover process happens every 28 days (20s), longer in 30s/40s
What is the Stratum Lucidum
Second layer of the Epidermis
Liquid/clear layer
Contains clear keratin cells - allows shine to go through
Readily visible on palms of hands and soles of feet
What is the Stratum Granulosum
Third layer of the Epidermis
Granular layer
Contains small sacks of cells with matter that resembles a granular form. Cells are filled with Keratin
What is the Stratum Spinosum
Fourth layer of the Epidermis
Spiny layer
Desmosomes-keratin filament - designed to hold lipids and proteins together and provide stability for cells and tissue
What is the Stratum Germinativum?
Fifth layer of the Epidermis
Basal cell layer
Mitosis takes place in this layer
Melanocytes are found in this layer too
How thick is the Dermis?
25x thicker than epidermis
What are the two layers of the Dermis
papillary and reticular
What percentage of the dermis is collagen?
70% of the dermis is collagen
Assists in giving skin strength and support necessary for wound healing
