Integumentary System Flashcards
functions of skin
thermoregulation, protection, sensing
what is skin made of
keratinized stratified squamous cells
three general layers of skin
epidermis, dermis, hypodermis
thin skin
hairy, only 4 layers of epidermis
thick skin
nonhairy, 5 layers of epidermis
layers of epidermis
stratum corneum, lucidum (thick skin only), granulosum, spinosum, basale
corneum
top layer of dead cells
lucidum
only in thick skin, more dead cells, thickened layer
granulosum
adult cells, filling with keratin
spinosum
baby cells, maturing
basale
parent cells
Integumentary cells
keratinocytes, stem cells, melanocytes, langerhans cells, merkel cells
keratinocytes
produce keratin, epidermis, stratum spinosum
stem cells
produce new skin cells, basale
melanocytes
produce melanin, spinosum
langerhans cells
immune response, spinosum
merkel cells
respond to touch, basale
dermis
holds everything together
layers of dermis
papillary and reticular
papillary region
areolar tissue, has dermal papillae that increase surface area
reticular region
dense irregular tissue
Meisner’s corpuscles
underneath epidermis, fine touch
pascinian corpuscles
between dermis and hypodermis, pressure, looks like sliced onion
dermis holds
accessory structures, blood vessels, nerve endings
dermis accessory structures
hair follicles, arrector pili muscles, glands
