下唇系带
Frenulum labii inferioris
定义
每侧唇的内表面在中线处通过一条黏膜皱襞与相应的牙龈相连，该皱襞称为系带——上唇系带较大。
參考資料
This definition incorporates text from a public domain edition of Gray's Anatomy (20th U.S. edition of Gray's Anatomy of the Human Body, published in 1918 – from http://www.bartleby.com/107/).
