Epidermal Derivatives Flashcards
epidermal derivatives (epidermal appendages)
integumentary structures derived from the epidermis
structures
nails, hair, exocrine glands of the skin
nails
scalelike modifications of the stratum corneum
functions of the nails
protect dorsal tips of fingers or toes and help with grasp
nail root
imbedded in the skin, can’t see superficially, producing new cells
nail bed
skin deep to the nail
nail groove
nail meets skin
nail fold
sticks up, later to groove
cuticle
proximal end, thin strip of tissue
body
everything other than root, not imbedded in skin
lanula/lanule
white, crescent shaped, blood vessels are blocked
free edge
the white that you file or cut
hair zones
root, shaft, bulb
root
deep to skin, imbedded in skin
shaft
superficial to skin
bulb
base of hair, cells undergoing mitosis, older cells pushed outwards causing growth
inner layer of hair
medulla, deepest
middle layer of hair
cortex, superficial to medulla
outer layer of hair
cuticle, outer most layer
hair follicle
space or cavity in the skin where hair is found
arrector pili muscles
goosebumps, makes hair stand up
two types of exocrine glands
sweat (sudoriferous) glands and sebaceous glands
sweat (sudoriferous) glands
merocrine/eccrine sweat glands: coil tubes that have ducts that travel directly to surface of skin
watery sweat
shouldn’t be an odor, used to cool the body
functions of the sweat (sudoriferous) glands
thermoregulation and protection
