The biceps femoris muscle, part of the hamstring group in the posterior thigh, has several synergist muscles that assist in performing similar actions. Two primary synergists are the semitendinosus and the semimembranosus muscles.
The semitendinosus muscle helps flex the knee and extend the hip, similar to the biceps femoris. As these muscles work together, they provide greater strength and efficiency in movements like running and jumping. Additionally, the semimembranosus muscle also aids in flexing the knee and extending the hip, further enhancing the action performed by the biceps femoris.
In summary, the semitendinosus and semimembranosus are the two main synergist muscles that collaborate with the biceps femoris, contributing to effective movement patterns in the lower body.