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Tissue

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).

Apical

Free Surface

Basal

Attached Surface

Arrangement of Layers

Simple, Stratified, & Pseudostratified

Simple

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

Stratified

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

Pseudostratified

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

Cell Shapes

Squamous, cuboidal, columnar, & transitional.

Squamous

Flattened, scale-like.

Cuboidal

Hexagons (sometimes); cube shaped in cross section.

Columnar

Tall, cylindrical.

Transitional

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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