Pursing of the lips requires contraction of which muscle?
A) Orbicularis oris
B) Buccinator
C) Risorius
D) a & b
E) b & c
Question 2
Retraction of the lips requires contraction of which muscle?
A) Orbicularis oris
B) Buccinator
C) Risorius
D) a & b
E) b & c