Final answer:
The vastus medialis is the most medial muscle of the entire femur, located in the anterior compartment of the thigh, forming part of the quadriceps femoris group.
Step-by-step explanation:
The most medial muscle of the entire femur is part of the adductor group of muscles, specifically the vastus medialis. This muscle is located in the anterior compartment of the thigh. The vastus medialis is one of the four muscles that make up the quadriceps femoris group, which is responsible for extending the knee. Alongside the vastus medialis in the medial compartment, there are other muscles like the adductor longus, adductor brevis, adductor magnus, gracilis, and pectineus that contribute to the adduction of the thigh. Additionally, the gracilis is involved in flexing the leg at the knee.