Stratified epithelia

Squamous nonkeratinizing

Function: barrier, protection.

Location: wet surfaces: oral cavity, esophagus, and vagina.

Origin: ectoderm

• cells of basal layer (stratum germinatinum, stratum basale)
• cells of stratum spinosum
• squamous cells

Stratified squamous keratinizing (epidermis)

Function: barrier, protection.

Location: dry surfaces: skin.

Origin: ectoderm

• keratinocytes of stratum germinatinum (stratum basale)
• keratinocytes of stratum spinosum
• keratinocytes of stratum granulosum
• keratinocytes of stratum lucidum
• squames of keratin of stratum corneum
• melanocytes

Stratified cuboidal & columnar

Function: barrier, conduit.

Location: sweat gland, ducts of exocrine glands, anorectal junction.

Origin: ectoderm

Transitional

Function: barrier, distensible property.

Location: renal calyces, ureters, bladder, urethra.

Origin: mesoderm