Question

The muscle contraction of lower jaw is due to

• A. Flexor and extensor
• B. Pronator and supernator
• C. Elevator and depressor
• D. Abductor and adductor

Answer 1

Answer: (C)

Elevator and depressor

There are different types of muscles which are classified on the basis of their action. The muscles of the lower jaw act as elevators and depressors. There are three muscles which are responsible for the elevation of the mandible, masseter, temporalis and the medial pterygoid. The muscles which are known as depressors and help in the lowering of the jaw are geniohyoid, mylohyoid, anterior digastric and lateral pterygoid.

Thus, the correct answer is option C.