Synergists

Synergists: Synergist muscles assist the prime mover in performing a joint action. That is, all muscles that can perform a joint action that are not the prime mover, are termed synergists. Example: The rectus abdominis is the prime mover of spinal flexion. All other muscles that can perform spinal flexion are synergists including – external obliques, internal obliques, and the psoas.