Contraction of the zygomatic major muscle elevates and retracts the corner of the mouth, while the depressor labii inferioris pulls the lips down and out.
Contraction of the zygomatic major muscle elevates and retracts the corner of the mouth, while the depressor labii inferioris pulls the lips down and out.
大颧肌控制嘴角的延展和收缩动作，降鼻翼肌则负责使上下唇上下移动。