Which muscle extends the knee and lies deep to the rectus femoris?

Study for the Muscle Actions and Functions – Anatomy and Movement Test. Equip yourself with multiple choice questions, each with detailed explanations and hints. Prepare confidently for your exam!

Multiple Choice

Which muscle extends the knee and lies deep to the rectus femoris?

Explanation:
Extending the knee is a main action of the quadriceps group. Among them, the vastus intermedius sits deepest, tucked under the rectus femoris right on the front of the femur and between the vastus medialis and vastus lateralis. Its fibers join the quadriceps tendon and patellar ligament to help straighten the knee. The rectus femoris is more superficial and also crosses the hip, while the other two vasti lie to the sides. Because it lies beneath the rectus femoris and contributes to knee extension, the vastus intermedius fits the description perfectly.

Extending the knee is a main action of the quadriceps group. Among them, the vastus intermedius sits deepest, tucked under the rectus femoris right on the front of the femur and between the vastus medialis and vastus lateralis. Its fibers join the quadriceps tendon and patellar ligament to help straighten the knee. The rectus femoris is more superficial and also crosses the hip, while the other two vasti lie to the sides. Because it lies beneath the rectus femoris and contributes to knee extension, the vastus intermedius fits the description perfectly.

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