Stratified cuboidal epithelium is rare and is typically found in which structures?

• A. Lining of stomach
• B. Ducts of sweat and mammary glands
• C. Alveolar sacs
• D. Surface of skin

Answer: (B)

Stratified cuboidal epithelium is a rare, protective lining that appears in the ducts of certain large exocrine glands, where multiple cube-shaped cell layers provide sturdy conduit walls. The classic sites are the ducts of sweat glands and mammary glands, where this two- to few-layer cuboidal lining helps withstand mechanical stress while conveying secretions.

These options don’t fit because the stomach lining is made of simple columnar epithelium specialized for secretion and absorption, the alveolar sacs in the lungs are lined by simple squamous epithelium suited for gas exchange, and the skin surface is covered by keratinized stratified squamous epithelium designed for protection, not cuboidal duct lining.