Hair

Question 1

Function of hair

Answer 1

Thermoregulation
Protection
Sensory detection (whiskers)
Filtering bacteria (nostrils)
communication
Help hearing

Question 2

Structure of hair (from outside to inside)

Answer 2

C.T. sheath
glassy membrane
external root sheath (cuboidal keratinized, usually 2 layer)
Internal root sheath
-henle’s layer
-Huxley’s layer (trichohyaline cartilage)
-cuticle of IRS
cuticle of hair shaft (very thin)
Cortex (squamous flat cells, contian melanin)

Question 3

Sebaceous gland

Answer 3

non-keratinized non squamous stratified epithelium
fat wax phospholipid
basal cell outside

Question 4

Sweat gland

Answer 4

simple coiled tubular
excretory duct: 2 layer cells, stratified cuboidal epithelium
secretory portion: simple columnar, 1 layer, myoepithelial cells