鼓膜脐
Umbo membranae tympanicae
定义
锤骨柄紧密附着于鼓膜内侧面，延伸至其中心，并将该处向鼓室方向牵拉；鼓膜外侧面因此呈凹陷状，该凹陷最深处称为鼓膜脐。
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/).
