Biceps femoris, also known as the hamstring muscle, is a muscle located at the back of the thigh. This muscle plays a crucial role in knee flexion and hip extension, making it an important muscle for athletes and individuals who engage in physical activity. There are several synonyms for the term biceps femoris, including the long head of the biceps femoris, the short head of the biceps femoris, and the hamstring muscle. Other synonyms include the semitendinosus muscle, the semimembranosus muscle, and the ischial tuberosity. Understanding these synonyms can improve communication between medical professionals and athletes, allowing for more effective treatment and training.