layers of skin Flashcards
thin skin
sweat/sebacous glands and hair follicles
thick skin
only found on palms of hand and soles of feet
–> no hair follicles and increased tactile receptors
2 main layers
epidermis (not vascularized)
–>stratified squamous
dermis (vascularized)
–>dense irregular connective tissue
epidermis
made of keratinized stratified squamous
5 cell types
keratinocytes, stem cells, melanocytes, dendritic cells, and tactile cells
layers of epidermis (superficial to deep) in thin skin
stratum corneum
stratum granulosum
stratum spinosum
stratum basale
layers of epidermis (superficial to deep) in thick skin
stratum corneum
stratum lucidium
stratum granulosum
stratum spinosum
stratum basale
stratum basale
deepest layer above basement membrane
–> where keratinocytes are produced
–> mitosis occurs (requires nutrients from dermis
stratum spinosum
prickly layer of keratinocytes and dendritic cells
–> keratinocytes begin producing keratin
–>desmosomes give spiny appearance
stratum granulosum
granular layer of keratinocytes
–> process in which cells fill with keratin and flatten out
–> lamellar: slows water loss
stratum lucidium
clear layer with few dead keratinocytes
–> helps with waterproofing
–> only found in thick skin
stratum corneum
horny layer filled with keratinocytes
layers of dermis
papillary layer (loose areolar)
reticular layer (dense irregular
hypodermis (not apart of integumentary system)
made of adipose and areolar ct
function: padding, storage, insulation, and anchors skin to tissue
