Final answer:
The muscles in the medial compartment of the thigh are primarily responsible for adducting the femur at the hip and the gracilis also assists in flexing the leg at the knee.
Step-by-step explanation:
In general, muscles in the medial compartment of the thigh are responsible for the action of adducting the femur at the hip. These muscles include the adductor longus, adductor brevis, adductor magnus, and pectineus. In addition to these, the gracilis muscle not only adducts the thigh but also plays a role in flexing the leg at the knee.