Anatomy - epithelial cells

simple squamous epithelium

-single layer of flattened cells

-function: Passage of materials by diffusion and filtration.

-location: kidney, air sacs of the lungs

simple cuboidal epithelium

-single layer of cube-like cells with large, spherical central nuclei

-function: secretion and absorption.

-location: kidney tubules and ovary surface

simple columnar epithelium

-single layer of column shaped cells.

-function: absorption: secretion of mucus, enzymes, and other substances; ciliated types propels mucus or reproductive cells by ciliary action.

-location: (Ciliated - with cilia) lines the digestive tract, gallbladder.

(with no cilia) uterine tubes and uterus.

pseudostratified columnar epithelium

-tissue that consists of a single layer of irregularly shaped and sized cells that give the appearance of multiple layers.

-function: secretion of mucus

-location: ( no cilia) in ducts of large glands

(with cilia): Lines the trachea and upper respiratory tract.

stratified squamous epithelium

more than one layer of cells, can be many, many layers. It is the thickest epithelial tissue.

-function: protects underlying tissues in areas subjected to abrasion.

-location: NON KERATINIZED lining of the esophagus and in the mouth

Keratinized stratified squamous epithelium

more than one layer of cells, can be many, many layers. It is the thickest epithelial tissue.

-function: protects underlying tissues in areas subjected to abrasion.

-location: epidermis of the skin

stratified cuboidal epithelium

-Two layers of cube-like cells

-function: protection.

-location: salivary glands.

stratified columnar epithelia

- serveral layers basal cells usually cuboidal and superficial cells elongated

- function:- protection and secretion

location round in male urethra and large ducts of some glands

transitional epithelia

Has characteristics of stratified cuboidal and stratified sqamous

-function-permits distension of urinary organs when they are filled with urine

location- epithelium of urinary bladder, ureters, proximal urethra

endocrine glands

glands that secrete chemicals called hormones directly into the bloodstream.

exocrine glands

ducts carry products of exocrine glands to epithelial surface

loction- mucus- secreting glands

lateral surface features-cell junctions

-tight junctions

-adhesive belt junctions

-desmosomes

-gap junctions

loction- found at apical region of most epithelial tissues types