Epidermal Structures and Diseases Flashcards
What is contained w/I the dermis?
blood vessels, nerves, appendageal structures (hair, sweat and sebaceous glands, etc)
What is the job of the dermis?
provides major tensile strength of the skin
How thick is the dermis?
it varies- btw 1-4 mm deep
The dermis lies btw the ____ and the ____.
epidermis, subcutaneous tissue
The two layers of the dermis are the ____ layer and the ____ layer.
papillary; reticular
What layer of the dermis is the upper layer, has thick collagen bundles, and interlocks with the epidermis?
the papillary dermis
Why does the papillary dermis interlock with the epidermal rete?
to increase strength and surface area
Describe the reticular layer of the dermis.
it’s deeper, has thick collagen bundles and visible elastic fibers
Why are scars more fragile than the original skin?
the interlocking network from the dermis to epidermis has been compromised
What are the 3 building blocks of the epidermis and their function?
- collagen (tensile strength)
- elastic fibers (resilience)
- ground substance (allows diffusion)
What is the most important collagen in the dermis, accounting for 80% of the weight?
type I collagen
What collagen is important in the fetus?
type III collagen
What kind of collagen is found in the basement membrane?
type IV
What does EDS stand for?
Ehlers-Danlos Syndrome
EDS is a disorder of the ____.
collagen
