lab 3 - epithelial cells

pigmented skin (brown)

thin skin

hairy skin

thick skin

ciliated pseudostratified epithelium - found in trachea

simple columnar

stratified squamous - found in vagina

simple squamous - found in cheek

cuboidal - kidney

urothelium - ureter

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