Surface Palpation - Head and Neck - Muscles
Masseter
Sitting or standing
 
Anterior or lateral, or anterolateral to the patient
 
Please sit (or stand). I would like to check the function of a muscle of your jaw. Please look at this picture of a person clenching the teeth. (Or . . . Please look at me while I clench my teeth.) May I touch the side of your face?
(If the answer is yes) I will gently place my fingers on that area while you clench your teeth.
(If the answer is no) Please clench your teeth, relax, and then clench your teeth again while I observe.
The patient/client is sitting (or standing) and either facing a mirror or facing the person who will demonstrate clenching the teeth. After showing a picture or demonstrating this motion, ask the patient/client to clench his/her teeth. With the muscle relaxed initially and with permission, gently place one or two fingers on the lateral face near the mandible and ask the patient/client to clench the teeth. Ask the person to relax and repeat these motions if necessary. If permission is not granted, then observe as the person clenches the teeth, relaxes and then clenches the teeth again.

This video demonstrates palpation of the masseter as well as the temporalis muscles. The masseter is palpated near the mandible, and the temoralis is palpated on the temple. These muscles are palpated only after muscle activation for better viewing. The correct technique of palpation of muscle includes the sequence of muscle activation, relaxation of the muscle, placement of the fingers on the muscle before the muscle is activated, activation of the muscle, and relaxation of the muscle.