U2- Integumentary System Flashcards
functions
resistance to trama and infection
sensation
thermoreg.
nonverbal comm.
layers
epidermis
dermis
hypodermis
epidermis-cell types
keratinocytes
melanocytes
keratinocytes
synth. keratin
melanocytes
synth. pigment (melanin)
branch btw keratinocy. and shed fragments
epithelium layers (BSGLC)
(deep to superficial) basal spinosum granulosum lucidium corneum
basal layer
site for stem cell division (mature into keratinocytes)
spinosum layer
cells getter flatter towards surface
desmosomes bridge cells together
gransulosum layer
dark staining layer
lucidum layer
!!seen only in thick skin!!!!
no cell boundaries visible
corneum layer
surface layer
where dead, scaly keratinocytes flake off
keratinocyte cell cycle
regen faster if injured
cell originate in basal and push up
cell regen is slower w/ age
dermis
CT layer
houses nerves, glands, hair follicles and roots
zones of dermis
papillary and reticular
papillary zone
thin areolar CT towards surface
reticular zone
fibrous deep
hypodermis
“subcutaneous tissue”
binds skin to underlying tissue
filled w/ adipose tissue
hemoglobin
red pigment of blood
areas w/ capillaries closer to surface= mre red
dark skin
greater amount of melanin
granules in k-ocytes spread out
melan. breaks down slower
light skin
lesser amount of melanin
granules in k-ocytes concentrated near nucleus
melan. breaks down fast
tactile cells
oval shaped
sensors for light touch sensation
Messiner’s corpuscle
close to skin surface
transmit sensations of fine, discriminative touch and vibration
Pacinian corpuscle
look like sperm, deep in dermis
detect pressure and high-frequency vibration
