Lateral movement of the mandible occurs when the internal and external pterygoid muscles:

Question

Quizplus · Accepted Answer

Lateral movement occurs when the internal and external pterygoid muscles on the same side of the face contract together.
Side-to-side grinding movements occur from alternating contractions of the internal and external pterygoid muscles,first on one side and then on the other.
Retrusion occurs when the internal and external pterygoid muscles relax on both sides together.
Protrusion happens when the internal and external pterygoid muscles on both sides contract together.

Lateral Movement of the Mandible Occurs When the Internal and External