The muscle that aids the jaw in closing is the temporalis muscle. The masseter is the muscle that primarily moves the jaw.
A synergist muscle helps a prime mover muscle in creating a specific movement. It assists the prime mover by reducing unnecessary movements and helping stabilize the joint. Synergist muscles work together to produce coordinated movement.
A synergist muscle is a muscle that aids another by promoting the same movement.
The masseter is the prime mover of the jaw closure.
The synergist to the smiling muscle (zygomaticus major) is the orbicularis oculi muscle, which is responsible for the contraction around the eyes and contributes to the overall expression of a smile.
Piriformis
The temporalis muscle acts synergistically with the masseter muscle to elevate the mandible during jaw closure or clenching. It is one of the primary muscles responsible for chewing and mastication.
The rectus femoris muscle is a synergist of the iliopsoas. It works together with the iliopsoas to flex the hip joint.
infraspinatus muscle
Gastrocnemius
agonist, antagonist, synergist
Latissimus dorsi is the synergist of the teres major.Specifically, a synergist is a muscle which acts with another. The latissimus dorsi helps adduct and rotate the shoulder to elbow bone called the humerus. The teres major is a shoulder-related muscle.