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Group of similar cells and their intercellular substance; similar origin in embryo; function together to perform specialized activity.

Epithelial (Classification & Function)

Cover body surfaces; lines body cavities & ducts; form glands.

Epithelial tissues consist of...

Largely or entirely of closely packed cells with little or no intercellular material between adjacent cells.

Epithelial tissues are arranged in...

Continuous sheets - nerves may extend through sheets, but blood vessels do not (avascular).

Epithelial tissues overlies and...

Adheres firmly to basement membrance (CT).


Free Surface


Attached Surface

Arrangement of Layers

Simple, Stratified, & Pseudostratified


Single layer; absorption & filtration; areas of minimal wear & tear.


Several layers; stacked; areas of high degree of wear & tear.


One layer; some layers do not reach surface; multi-layered (stratified) appearance; columnar epithelial tissue.

Cell Shapes

Squamous, cuboidal, columnar, & transitional.


Flattened, scale-like.


Hexagons (sometimes); cube shaped in cross section.


Tall, cylindrical.


Distension (expansion); combination of shapes.

Simple Squamous ET

Lines blood vessels & air sacs; serous membranes.

Simple Cuboidal ET

Lines kidney tubes & ducts of glands.

Cilitated Simple Stratified Columnar ET

Upper respiratory tract; fallopian tubes.

Non-ciliated Simple Columnar ET

G.I. Tract.

Keratinized Stratified Squamous ET

Epidermis (skin).

Non-Keratinized Stratified Squamous ET

Lining of mouth, esophogus, vagina.

Transitional ET

Urinary bladder, ureters, urethra

Ciliated Psedostratified Columnar ET

Eustachian Tube

Non-Ciliated Psedostratified Columnar ET

Lines larger ducts of glands, male urethra.

Exocrine Glandular ET

Oil glands & sweat glands.

Endocrine Glandular ET

Secretes hormones; pituitary gland, thyroid gland, parathyroid glands, thymus gland, pineal gland.

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