classification of epithelium

the epithelia is classifed by

1. cell shape AND # of layers (3)

2. location and function

   • can cover (skin) or line (alimentary canal)

   • glandular epithelium (glands that secrete hormones)

cell shape is

• squamous

• cubodial

• columnar

number of layers

• simple

• stratified

• psuedostratified

squamous

thin layer, leaf like

cubiodal

cube like

columnar

columns (long)

simple

one layer

stratified

multiple layers

pseudostratified

looks stratified but not

what are the extra?

transitional and uroepithelium (urinary system)

germinal epithelium (sperm)

simple squamous epithelium definition

single layer of flat cells

simple squamous epithelium function

• filtration

• absorption

• protection

simple squamous epithelium found in

• tympanic membrane (ear)

• bowans capsule (kidney)

• lung alveoli

simple squamous epithelium are modified what are those names?

• mesothelium

• endothelium

• endocardium

mesothelium

lines body cavities - abdominal, pericardial, pleural

endothelium

lining of blood and lymphatic vessels

endocardium

lining of ventricles & atria of heart

what is the clinical point

mesothelioma - aggressive tumors

• symptoms - shortness of breath

simple cuboidal epithelium definition

single layer of equal height and width

simple cuboidal epithelium function

• absorption

• secretion

…..

simple cuboidal found in

• thyroid gland

• free surface of ovaries

• ducts of glands

• kidney tubules

simple columnar epithelium defintion

single layer but taller than wider

• most have microvilli

• have junctions

simple columnar epithelium function?

• absorption

• secretion

simple columnar epithelium found in?

• lining of organs

• digestive tract

• uterus

• oviduct

• bronchi

• gallbladder

simple columnar epithelium modified names?

• goblet cells

• simple columnar ciliated

goblet cells help in

mucus secretion

simple columnar ciliated help in

dust protection in respiratory tract

stratified sqaumous defintion

multiple layer

stratified squamous function

protection

…

stratified squamous epithelium found in

• epidermis

• mouth

• espophagus

stratified squamous cells will be

• keratinzed - protected - epidermis

• nonkeratinized - protected - mouth, tongue, vagina

stratified cuboidal defintion

mutilple layer…

stratified cuboidal function

protection

stratified cubodial found in

• duct of glands

• male urethra

stratified columnar function

• protection

• secretion

stratified columnar found in

• male urethra

• vagina

• pharynx

pseudostratified columnar function

protection

pseudostratified found in

• male urethra

• exretory ducts

ciliated psuedostratified columnar function

• dust trapping

• move mucus

ciliated psuedostratified columnar found in

• trachea

• bronchi

transitional (uro) function

prevent organ rupture

transitional (uro) found in

• urinary baldder

• ureter