National Dental Assisting Examining Board (NDAEB) Practice Exam

What is the anatomical term for a narrow fold of mucous membrane connecting fixed and movable body parts?

1. Rugae

2. Commissures

3. Frenum

4. Papillae

The correct answer is: Frenum

The anatomical term for a narrow fold of mucous membrane that connects fixed and movable body parts is "frenum." This structure plays an important role in various anatomical locations within the body. For example, in the oral cavity, the frenulum attaches the tongue to the floor of the mouth, and there are also labial and buccal frenula that connect the gums to the lip and cheek, respectively. Understanding the function of a frenum is essential in dental assisting, as it can impact various procedures and treatments, especially in orthodontics and oral surgery. Recognizing its presence and understanding its significance can help dental professionals address issues related to oral function, speech, and overall oral health. In contrast, rugae refers to the folds in the stomach lining that allow for expansion; commissures refer to points where two structures meet, particularly in the context of the lips or eyelids; and papillae are small projections on the surface of the tongue or skin that serve different sensory and mechanical functions. Each of these terms denotes specific anatomical structures but does not convey the same connection role that a frenum does.