lab 3 - epithelial cells

pigmented skin (brown)

thin skin

hairy skin

thick skin

ciliated pseudostratified epithelium

simple columnar

stratified squamous

simple squamous

cuboidal

urothelium

glandular epithelia

salivary gland

areolar connective tissue

cardiac

adipose

reticular

bone

blood smear

hyaline cartilage

dense regular tissue

epidermis

skin

-outermost layer

-undergoes exfoliation; barrier protection

stratum corneum

-2nd layer

-protection against abrasion & adds thickness

stratum lucidum

-middle layer with keratinocyte & lipids

-produces keratin for strength, waterproof barrier & protection

stratum granulosum

-4th layer

-skin renewal, strength & flexibility, immune defense

stratum spinosum

-next to basement membrane

-cell division & skin regeneration, protection in melanin, & aids in wound healing

stratum basale

finger like projection

-increase nutrient exchange, strengthen skin, & form fingerprints

dermal papillae

connected to nerve superiorly deep to skin

-detects low frequency vibration

tactile corpuscle

connected to sensory nerve deep in skin

-detect high frequency vibrations

lamellar corpuscle

deepest layer of skin

-insulation, energy storage, protection

subcutaneous layer

surrounds hair root

-support hair growth & anchors hair

hair follicle

protects skin

hair

attaches to hair follicle

arrector muscle of hair

connected to hair follicles

-produce sebum & conditions hair

sabaceous glands

forehead, palms, & soles

-cools body & maintains electrolyte balance

eccrine

axillary & genital areas

-produces thicker sweat

apocrine

find thinnest keratinized epidermis?

eyelids

2 functions of keratinocytes

-protection

-immune defense + healing

function of capillary networks in dermis?

nourishment, waster removal, temperature, regulation, healing, & immune defense

which layer have accumulations of melanin in their cells

stratum basale

function of melanin in the skin

protection from UV light

carotene origin & function

carrots

-serves as vitamin a precursor