What is a frenulum?

A frenulum is a small fold of mucous membrane that serves to stabilize or restrict movements of various structures in the body. For instance, in the mouth, the frenulum is located under the tongue (lingual frenulum) and attaches it to the floor of the mouth, allowing for proper movement during speaking and eating. There are also frenula in other areas, such as the lips and the genitals, which have similar stabilizing functions. This anatomical structure plays a crucial role in maintaining the position and function of surrounding tissues, highlighting its importance in both oral and general anatomy. The other options do not accurately describe what a frenulum is; they pertain to surgical procedures, types of muscle, or medications, none of which relate to the definition of a small fold of mucous membrane.