Knowledge of the anatomy of the masticatory muscles is extremely important for understanding para functional muscle disorders. This article describes the anatomy of the masticatory and temporal muscles proper in their hypertonicity from the position of ultrasound examination. With the help of qualitative and quantitative indicators, the structure of the masticatory and temporal muscles proper was studied at rest and under stress. Ultrasound examination revealed point and linear hyperechoic inclusions, trigger points, which made it possible to verify muscle hypertonus.