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

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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:
The knee is extended mainly by the quadriceps group, and the one that lies deepest under the front muscle, the rectus femoris, is the vastus intermedius. Its fibers run between the other vastus muscles and it sits directly beneath rectus femoris in the anterior thigh. When it contracts, it helps straighten the knee as part of the quadriceps tendon assembly that attaches to the patella. Rectus femoris itself also extends the knee but sits superficially and crosses the hip, giving it a dual role. The other vasti are positioned at the sides and do not lie beneath rectus femoris.

The knee is extended mainly by the quadriceps group, and the one that lies deepest under the front muscle, the rectus femoris, is the vastus intermedius. Its fibers run between the other vastus muscles and it sits directly beneath rectus femoris in the anterior thigh. When it contracts, it helps straighten the knee as part of the quadriceps tendon assembly that attaches to the patella. Rectus femoris itself also extends the knee but sits superficially and crosses the hip, giving it a dual role. The other vasti are positioned at the sides and do not lie beneath rectus femoris.

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