Besides the primary muscles of mastication, some facial and neck muscles are also involved in mastication. These muscles do not serve as muscles that primarily act during chewing, and that is why they are called the accessory or secondary muscles of mastication. They include the following muscles:

Buccinator (Read more!) - facial muscle;
Digastric (Read more!) - suprahyoid neck muscle;
Stylohyoid (Read more!) - suprahyoid neck muscle;
Mylohyoid (Read more!) - suprahyoid neck muscle;
Geniohyoid (Read more!) - suprahyoid neck muscle;
Sternohyoid (Read more!) - infrahyoid neck muscle;
Sternothyroid (Read more!) - infrahyoid neck muscle;
Thyrohyoid (Read more!) - infrahyoid neck muscle;
Omohyoid (Read more!) - infrahyoid neck muscle.

The buccinator is primarily a facial muscle that participates in forming the anterior part of the cheek and the lateral wall of the oral vestibule. However, it is also involved in mastication, as it keeps food pushed back within the oral cavity.

The suprahyoid and infrahyoid muscles are found within the neck. The suprahyoid muscles are located above the hyoid bone, while the infrahyoid muscles are also connected to the hyoid bone but are positioned below the bone. The primary function of the suprahyoid and infrahyoid muscles is to depress or elevate the hyoid bone and larynx.

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Accessory muscles of mastication