A report published in the Annals of Anatomy recently stated that the coronoid part of the masseter was a newly described layer. However, there have been numerous discussions regarding the layered structures in the masseter and temporalis. In this review, we show that the muscle bundle stated as a newly described layer could be similar to the zygomaticomandibularis that was previously reported. Knowledge of various muscle bundles with different fiber directions is essential to understanding the stabilization and closing functions of the jaw. Therefore, the layered structure of the masseter and temporalis should be considered more for clinical and functional applications.