» "Frenula" redirects here. For the brachiopod genus, see Frenula (brachiopod) A frenulum (or frenum, plural: frenula or frena, from the Latin frēnulum, "little bridle", the diminutive of frēnum )'s a small fold of tissue that secures or restricts the motion of a mobile organ in the body. In human anatomy Frenula on the human body include several in the mouth, some in the digestive tract, and some connected to the external genitalia. Oral tissue: Frenula of the mouth include the fren… (More on Frenulum)