Which pair of muscles of mastication contract together to allow the mandible to move forwards?

The lateral pterygoid muscle is primarily responsible for moving the mandible forward, also known as protraction. This muscle works by contracting bilaterally (on both sides), causing the head of the mandible to move anteriorly and downward. This action is crucial during activities such as biting and grinding food, as it allows the jaw to open wide and shift forward to position food optimally for chewing.

The lateral pterygoid also plays a critical role in the movements of the jaw, such as during lateral excursions where the jaw moves side to side. Given its function as a primary muscle for forward movement, it is pivotal in mastication. It works alongside other muscles of mastication, but when focusing specifically on protraction of the mandible, the lateral pterygoid is the key player.