Final answer:
The rectus femoris, vastus lateralis, vastus medialis, and vastus intermedius are innervated by the femoral nerve and compose the quadriceps femoris group, which extends the knee and stabilizes the leg.
Step-by-step explanation:
Major muscle innervations of the femoral nerve include the rectus femoris, vastus lateralis, vastus medialis, and vastus intermedius. These four muscles constitute the quadriceps femoris group, with the rectus femoris positioned on the anterior aspect of the thigh, the vastus lateralis on the lateral aspect, the vastus medialis on the medial aspect, and the vastus intermedius located between the vastus lateralis and vastus medialis, and is situated deep to the rectus femoris.
All these muscles contribute to extending the knee and are involved in leg stabilization, with a common tendon known as the quadriceps tendon that inserts into the patella, becoming the patellar ligament and attaching to the tibial tuberosity.