Chapter 5 Integumentary Flashcards
Outer epidermis
Superficial epithelium
•protects dermis
•protects water loss and entry of pathogens
Inner dermis
Connective tissues
•Papillary layer
•Reticular layer
Accessory structures
Originate in the dermis
Hair, nails, multicellular exocrine glands
Exocrine glands
Glands that secrete their products into ducts
Assist in temp regulation and waste excretion
Endocrine glands
Secrete their products directly into the bloodstream
Functions of Skin
- Protection of tissues and organs
- Excretion of salts, h2o, organic waste
- Maintenance of body temp
- Production of melanin/keratin
- synthesis of vitamin D3
- detection of touch, pressure, pain, temp
Integumentary functions
- external physical protection
- storage of lipids
- sensory info
- thermoregulation
Papillary layer
Nourishes and supports epidermis
Reticular layer
- Has sensory receptors that detects touch, pressure, pain, temp
- blood vessels assist in thermoregulation
Dermatitis
- Inflammation of the papillary layer
- caused by infection, radiation, mechanical irritation, chemicals
- characterized by itch or pain
Subaceous glands
Lubricate hair
Control bacteria
Regions of hair
Hair Root
•lower part
•attached to the integumentary
Hair Shaft
•upper part
•not attached
Components of the Cutaneous Membrane
Outer Epidermis
Inner Dermis
Avascular
Lack of blood cells
Exocrine glands in skin
Sebaceous Glands (oil glands)
•Holocrine glands
•Secrete sebum
