Dermis Flashcards
Dermis anchors
Epidermal accessory structures
Ex: hair follicles and sweat glands
Two components of the dermis
Outer papillary layer
Deeper reticular layer
Papillary layer consists of
Areolar tissue
Papillary layer contains
Capillaries, lymphatic vessels, and sensory neurons
Papillary layer become inflamed
In dermatitis
Caused by infection, radiation, mechanical irritation,or chemicals
May produce itching or pain
Reticular layer consists of
Dense irregular connective tissue
Reticular layer contains
Collagen and elastic fibers
The dermis contains all cells of
Connective tissue proper
Collagen fibers
Very strong
Resist stretching
Easily bent or twisted
Limit flexibility to prevent tissue damage
Elastic fibers
Permit stretching and then recoil to original length
Provide flexibility
Skin turgor
Fibers and water that provide flexibility and resilience
Loss of skin turgor is caused by
Dehydration, aging, hormones, uv radiation
Tension lines are produced
By parallel bundles of collagen and elastic in fibers the dermis
Tension lines resist
Forces applied to skin
A cut made parallel to a tension line
Remains shut, and heals well
Dermal blood supply comes from
Cutaneous plexus
Sub-papillary plexus
Cutaneous plexus is
A deep network of arteries along the reticular layer
Subpapillary plexus is a
Network of small arteries in papillary layer
Bruises (contusion) is caused by
Damage to blood vessels in dermis
Nerve fibers in skin control
Blood flow
Nerve fibers in skin
Adjust stand secretion rates
Nerve fibers m skin monitor
Sensory receptors
Tactile (meissner) corpuscles light touch) are in
Dermal papillae
Lamellar (pacinian) corpuscles (deep pressure) are in
The reticular layer
