frenum

/free-nuhm/US // ˈfri nəm //UK // (ˈfriːnəm) //

齿龈,齿槽,齿龈炎,齿形

Definitions

n.名词 noun

1
plural fre·na [free-nuh]. /ˈfri nə/. Anatomy, Zoology.
- : a fold of membrane that checks or restrains the motion of a part, as the fold on the underside of the tongue.

Aetius, the first prominent Christian physician of whom we have any record, divided the frenum of the tongue.
Alar frenum: a small ligament crossing the supra-alar groove toward the root of the wing: Hymenoptera.
It is of slow growth, and forms an elongated swelling on each side of the frenum, covering the teeth, and projecting the lip.
On each side of the frenum, under the mucous membrane of the tip, are mucous glands—apical glands—in which cysts sometimes form.
A double fold of mucous membrane—the frenum—connects the under aspect of the tip with the floor of the mouth and the mandible.