epidermal derivatives Flashcards
epidermal derivatives/epidermal appendages
integumentary structures derived from the epidermis; accessory structures
epidermal derivatives include
nails, hair, and exocrine glands of the skin
nails
scalelike modifications of the stratum corneum
nail functions
protect dorsal tips of fingers or toes, help with grasp
nail structures
root, bed, groove, fold, cuticle, body, lunula/lunule, edge
hair zones (longitudinal view)
root, shaft, bulb
hair root
everything deep to the skin
hair shaft
everything superficial to the skin
hair bulb
base of hair, where cells undergo mitosis
hair layers (cross-sectional view)
inner, middle, outer
inner layer of hair
medulla, deepest
middle layer of hair
cortex
outer layer of hair
cuticle
hair follicle
space/cavity where hair is found within the skin
arrector pili muscles
causes hair to stand
hair functions
protection, heat retention, sensory reception, visual identification
two types of exocrine glands
sweat (sudoriferous) and sebaceous
types of sweat glands
merocrine/eccrine and apocrine
merocrine/eccrine sweat glands
-coil tubes that have ducts that travel directly to skin
-mostly water
-cools the body
functions of the merocine/eccrine sweat glands
thermoregulation and protection
aprocrine sweat glands
-coil tubes that have ducts that open to hair follicles
-armpit, anal, and groin regions
-has an odor
sebaceous glands
secrete oily sebum into hair follicles or directly onto skin surface
acne
blocked sebaceous glands
