边缘部分
Pars marginalis musculi orbicularis oris
定义
口轮匝肌边缘部是向邻近肌肉放射的周缘边缘部分，对应于红唇区域。
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/).
