Layers of the Dermis Flashcards
What is dermis composed of?
The dermis is composed of dense irregular connective tissue.
What two layers form the dermis? What function does it serve?
The dermis is made of the papillary and reticular layers. The semifluid matrix binds the entire body together.
What is the papillary dermis comprised of ?
The papillary dermis is comprised of the areolar connective tissue, collagen, and elastic which are woven with small blood vessels.
What does the papillary dermis allow?
The papillary dermis allows the phagocytes to wander freely.
What is a dermal papillae?
The dermal papillae is a peg-like projection which indents in the overlying tissue.
What is a dermal ridge?
The mound atop dermal papillae which on the epidermis on the soles of the hands and feet. These create friction and allow for better grip of surfaces.
What is the combination of sweat and friction ridges known as?
Fingerprints which are genetically unique to each individual.
What is the reticular dermis?
The reticular dermis accounts for 80% of the thickness of dermis. It is comprised of dense irregular connective tissue.
What is the dermal vascular plexus?
The dermal vascular plexus is the network of blood vessels which nourish the dermis and subcutaneous layer of skin.
What makes up the extracellular matrix that runs parallel to the skin?
The extracellular matrix which runs parallel to the skin is made up of interlacing collagen fibers.
What causes the formation of tension lines on the skin?
Cleavage is formed from the separation of collagen fiber or lense dense areas of fibers.
What is the direction in which tension lines run across the body?
Tension lines run longitudinally across limbs. While they run in circular patterns across the trunk of the body.
What is the function of collagen fibers?
They give the skin strength, resiliency, while preventing minor penetrations from upsetting the dermis.
What is a flexure line?
Flexure lines are dermal folds at or near joints these occur from the dermis being tightly secured to deeper structures.
What does melanin synthesis depend on?
The synthesis depends of the enzyme called tyrosinase.
