Epithelium Tissue

Where is simple squamous epithelia found?

alveoli (lungs), glomeruli (tiny vessels in kidneys), endothelium (interior surface of blood vessels), serosa (lines internal closed body cavities)

Where is simple cuboidal epithelia found?

liver, thyroid, mammary, salivary and other glands, bronchioles, and most kidney tubules

Where is simple columnar epithelia found?

inner lining of GI tract, uterus, kidney, and uterine tubes

Where is pseudo-stratified epithelia found?

respiratory system

Where is stratified squamous epithelia found?

skin, cheek, cervix, where exfoliation occurs

Where is keratinized Stratified Squamous found?

in the epiderms of the skin

Where is Nonkeratinized Stratified Squamous found?

tongue, oral mucosa, esophagus, and vagina

Where is Stratified Cuboidal Epithelium found?

sweat gland ducts, ovarian follicles, seminiferous tubules (produces sperm)

Where is Transitional Epithelium found?

urinary tract, kidney, ureter, bladder

What is simple squamous epithelium?

one-layer thick, flat cells bulging at nucleus

• rapid diffusion or transport of substances through membrane; secretes lubricating serous fluid (helps wounds heal)

• located in the alveoli (air sacs) of lungs, kidneys, inner lining of heart and blood vessels, GI tract

What is simple cuboidal epithelium?

one layer thick, cube shaped, sometimes pyramidal around a central shape (lumen), may contain microvilli in kidney tubules or cilia in bronchioles of lungs

• absorbs + secretes, production + movement of mucus

• located in liver, thyroid, mammary, salivary glands, kidney tubules + bronchioles of lungs

What is simple columnar epithelium?

one layer thick, long rectangular or cylindrical cells, often have microvilli on apical surface, may possess goblet cells

• absorbs, secretes mucus, movement of egg + embryo in uterine tubes

• located in GI tract, gallbladder, uterus + uterine tubes

What is pseudo-stratified columnar epithelium?

appears multilayered; but only one layer thick; rectangular or cylindrical shaped, often contains goblet cells

• secretes + propels mucus

• located in the respiratory tract from nasal cavity to bronchi, portions of male urethra

goblet make mucin (glycoprotein) mucin make mucous

goblet make mucin (glycoprotein) mucin make mucous

what is stratified squamous epithelium? KERATINIZED

multi-layered, cells become increasingly flat towards surface, surface contains layer of compact dead cells W OUT nuclei, basal cells may be cuboidal or columnar

• resists abrasion + penetration by pathogenic organisms; PREVENTS water loss

• located in the epidermis (skin), heavily keratinized at palms of hands and soles of feet

what is stratified squamous epithelium? NON-KERATINIZED

multilayered, cells become increasingly flat towards surface; basal cells may be cuboidal or columnar.

• resists abrasion and penetration by pathogenic organisms (cause diseases)

• located in the tongue, oral mucosa, esophagus, anal canal, and vagina

What is stratified cuboidal epithelium?

multilayered, cube-shaped or round

• sweat secretion, secretes ovarian hormones; produces sperm

• located in the sweat gland ducts, egg-producing vesicles (follicles) of ovaries; sperm-producing ducts (seminiferous) tubules of testes

What is Transitional epithelium?

multilayered, cells at apical surface are rounded, some cells may be binucleated; may appear thinner when stretched

• stretches to permit distension; protects underlying epithelium from osmotic damage by urine

• located in the urinary tract, kidney ureter, bladder, urethra, umbilical cord