Opening of jaw is done by: (A) Temporalis, (B) Lateral pterygoid, (C) Med pterygoid, (D) Masseter
Answer is B. Lateral pterygoid is sho, conical, and has upper and lower heads. The lateral pterygoid: - depress mandible to open mouth, with suprahyoid muscles. - protrudes mandible - right lateral pterygoid turns the chin to left side.