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Define
Epithelial Tissue
A sheet of continuous cells, all in contact with one another, anchored on a basement membrane.
Define
Basement membrane
(Basal Lamina)  
Nonliving layer that acts as a foundation for epithelial cells. Secreted by the epithelium.
Characteristics
Stratified epithelial tissue
Several layers of cells,bottom layer only is attached to the basement membrane.
Characteristics
Simple epithelial tissue
Single layer of cells, all attached to the basement membrane.
Squamous
simple epithelial tissue
Flat, irregular shaped cells
central nucleus
found lining:
body cavities, organs, and blood vessels
Function:
diffusion of substance across a surface
Cuboidal
simple epithelial tissue
Cube shaped cells
central nucleus
found:
kidney tubules
lining ducts of glandular tissue
function:
absorption
secretion
Columnar
simple epithelial tissue
Column shaped cells
nucleus in lower potion of cell
found:
gastrointestinal tract
oviduct
function:
absorption
secretion
Squamous
Stratified epithelial tissue
Shape changes within stratum
cuboidal-deep
mixed-middle
squamous-surface
found:
Skin-keratinized
mouth-non-keratinized
esophagus-non-keratinized
vagina-non-keratinized
function:
protection-keratinized/non-keratinized
secretion-non-keratinized
Cuboidal
Stratified epithelial tissue
cuboidal shape
two layers of cells
central nucleus
found:
ducts of sweat glands
function:
absorption
secretion
Columnar
Stratified epithelial tissue
Two layers
deeper layer-cuboidal shape
surface layer-columnar shape
nucleus in bottom of cell
found:
portions of the male urethra
conjunctiva of the eye
some large excretory ducts of salivary glands
function:
absorption
secretion
protection
Pseudostratified epithelial tissue
"V" shaped
alternating v shapes
One layer of cells all attached to basal lamina
Not all cells reach the surface
Nuclei at different levels
found:
tracheal/primary bronchi
epididymis
vas deferens
function:
absorption
secretion
protection
transportation
Transitional epithelial tissue
Variable shape
cuboidal to columnar-deep
polyhedral-middle
flattened/dome shape-surface
Variable layers
nucleus:
surface
often bi nucleated
found:
ureters
bladder
function:
protection
distensible
Glands
composed of epithelial tissue
Shapes:
tubular
acinar
alveolar
Example of simple unbranched gland
sweat glands
Example of compound branched gland
salivary glands
exocrine pancreas
Simple tubular gland found:
crypts of Lieberkuhn in gut
Simple coiled tubular gland found:
sweat glands
Simple branched tubular gland found:
stomach glands
simple branched acinar glands found:
mucous of penile urethra
Compound tubuloacinar glands found:
compound alveolar
mammary glands
Compound tubular glands found:
major salivary glands
Compound acinar glands found:
Brunner's glands
glands of the duodenum
basal lamina
compound branched gland
epithelial tissue
glands
goblet cells
goblet cells
pseudostratified ciliated columnar epithelial cells
Pseudostratified columnar epithelial tissue
pseudostratified epithelial tissue
simple columnar epithelail tissue
simple cuboidal epithelail tissue
simple cuboidal epithelial tissue
simple epithelial tissue
simple squamous epithelial tissue
simple unbranched gland (ie sweat glands)
stratified epithelial tissue
stratified columnar epithelial tissue
stratified columnar epithelial tissue
stratified cuboidal epithelial tissue
stratified epithelial tissue
stratified squamous epithelial tissue
transitional epithelial tissue
transitional epithelial tissue
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