What is the insertion point for the vastus lateralis muscle?

• A. Greater trochanter
• B. Tibial tuberosity
• C. Medial condyle of tibia
• D. Fibula head

Answer: (B)

The vastus lateralis muscle, one of the four muscles that comprise the quadriceps group, primarily functions to extend the knee. Its insertion point is at the tibial tuberosity, which is the prominence on the anterior aspect of the tibia where the patellar tendon attaches. The connection to the tibial tuberosity allows the force generated by the vastus lateralis during contraction to effectively extend the knee joint.

In this context, the other possible points do not serve as the correct insertion for the vastus lateralis. The greater trochanter serves as an attachment for different hip muscles, while the medial condyle of the tibia and the fibula head have specific roles in joint articulation and muscle attachments for other muscle groups, but they are not the insertion points for the vastus lateralis. Thus, the tibial tuberosity is definitively where the vastus lateralis muscle inserts, enabling its action to extend the knee.