Dental Assistant Practice Exam

What is a key characteristic of lining mucosa?

1. It is keratinized and protects against abrasion

2. It is thick and adherent to bone

3. It is non-keratinized and permeable

4. It is only found on the hard palate

The correct answer is: It is non-keratinized and permeable

A key characteristic of lining mucosa is that it is non-keratinized and permeable. This type of mucosa is found in areas of the oral cavity that are not subjected to heavy wear and tear, such as the inner cheeks, lips, under the tongue, and the soft palate. The non-keratinized nature allows for flexibility and a moist surface, which is essential for functions such as speech and swallowing, while also facilitating absorption. The permeability of lining mucosa also makes it distinct; it allows for the easy passage of fluids and drugs, making it important in various medical and dental applications, including the administration of certain topical medications. This mucosa differs from other types, such as masticatory mucosa, which is keratinized to provide protection against abrasion from chewing and biting. In contrast, characteristics such as being keratinized and providing significant protection against abrasion pertain to types of mucosa found in areas of high friction, like the hard palate and gums. Additionally, being thick and adherent to bone describes tissues that are more firmly bound, which does not apply to lining mucosa. Lastly, lining mucosa is not restricted to the hard palate; it is more widespread throughout the mouth, appearing in various soft