National Dental Assisting Examining Board (NDAEB) Practice Exam

What type of epithelium forms the lining of the oral cavity?

1. Cuboidal epithelium

2. Columnar epithelium

3. Stratified squamous epithelium

4. Simple squamous epithelium

The correct answer is: Stratified squamous epithelium

The lining of the oral cavity is primarily formed by stratified squamous epithelium, which is well-suited for this environment due to its structure and characteristics. This type of epithelium consists of multiple layers of cells, which provides a robust barrier to mechanical stress, abrasion, and potential pathogens that the oral cavity frequently encounters during activities like chewing and speaking. Stratified squamous epithelium can be either keratinized or non-keratinized, with the keratinized type providing additional protection in areas of higher abrasion, while the non-keratinized type is found in regions that require more flexibility, such as the inside of the cheeks and the floor of the mouth. This versatility in the types of stratified squamous epithelium allows for protection while maintaining functional integrity. Other types of epithelium mentioned in the choices have specific roles in different parts of the body. For instance, cuboidal epithelium typically lines glandular ducts and certain organs, columnar epithelium is more common in the digestive tract and respiratory system, while simple squamous epithelium is found in areas requiring rapid diffusion or filtration, such as blood vessel linings. These other types do