Which of the following muscles is considered to be a prime mover for mandibular lateral deviation to the right?
a. Right masseter
b. Right medial and lateral pterygoid
c. Left medial and lateral pterygoid
d. Left temporalis
ANS: C
Lateral deviation is caused by unilateral action of various muscles. The prime mover appears to be
both the medial and lateral pterygoid muscles causing deviation of the mandible to the opposite
side. At times, lateral deviation can also be accomplished by the combined action of the lateral
pterygoid and temporalis muscle of the same side.
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