epidermis
outermost layer with 4-5 stratum layers, also contains keratinocytes and melanocytes
dermis
second layer made of connective tissue, layer has a rich blood supply, nerve fibers, and lymphatic vessels
subcutaneous
loose connective tissue and fat cells. an insulator and cushion for the body
epidermis tissues
keratinocytes
melanocytes
langerhans cells
merkel cells
skin functions
-protection
-barrier from virus and bacteria
- insulation
- sensory perception
- control of heat regulation
classifications of skin disorders
infections
inflammation
neoplastic
types of infections
bacteria
fungal
viral
parasitic
inflammation examples
acne
burns
eczema
dermatitis
psoriasis
neoplastic examples
squamous cell carcinoma, basal cell carcinoma, malignant melanoma
common skin disorders
dermatitis
insect + spider bites
infestations
acne vulgaris
primary lesion
arise from previously healthy skin
-macules, patches, papules, nodules, tumors, vesicles, pustules, bullae, and wheals
secondary lesions
result from changes in primary lesions
- crusts, scales, scars, keloids, erosion
skin turgor
pinching the skin near the clavicle, sternum, abdomen or forearm then letting go
tenting
when during skin turgor test, skin does not return to place but stays up
closed vs open wound
closed: tissues are traumatized w/o break in skin
open: skin or mucous membrane surface is broken
6 types of wounds
incision
contusion
abrasions
puncture
laceration
penetrating wound
partial vs full thickness
partial: confined to dermis and epidermis
full: involves dermis, epidermis, SQ tissue, and muscle and bone
treatment of wounds shortly after injury
control severe bleeding
prevent infection
control swelling
assess for signs of shock
4 phases of wound healing
inflammatory phase
localized redness
edema
warmth
throbbing
proliferative phase
wound filled w/ granulation tissue
- would contracts to reduce area that requires healing
- reepithelialziation of the wound
primary intention healing
-minimal or no tissue loss
- formulation of minimal granulation. + scarring
- sutured or stapled
secondary intention healing
extensive tissue loss, edges cant be closed, greater scarring
tertiary intention healing aka delayed primary closure
wound closure that occurs when a wound is initially left open to heal by secondary intention and then later closed surgically