Which three tendons converge at the medial knee to form the pes anserinus tendon?

Which three tendons converge at the medial knee to form the pes anserinus tendon?

• A. Semitendinosus, Gracilis, Sartorius
• B. Biceps Femoris, Semimembranosus, Popliteus
• C. Rectus Femoris, Vastus Lateralis, Vastus Medialis
• D. Tibialis Anterior, Extensor Digitorum Longus, Fibularis Tertius

Answer: (A)

The main idea is that the pes anserinus is formed by the tendons of three muscles that cross the medial knee and share a common insertion on the proximal, anteromedial tibia. Those three tendons are from the sartorius, gracilis, and semitendinosus. They come together just below the knee on the inner side of the tibia, creating the so‑called goosefoot (pes anserinus) tendon. Understanding why this trio fits is helpful: each of these muscles approaches the medial knee from a different compartment—sartorius from the front, gracilis from the inner thigh, and semitendinosus from the back—yet their tendons converge to a single attachment on the tibia. This arrangement helps stabilize the medial knee and assists with knee flexion. The other muscle groups listed don’t form this conjoined tendon on the medial tibia. Their tendons either insert elsewhere (for example, quadriceps tendons to the patella, or ankle-crossing tendons) or lie in different locations and directions, so they don’t create the pes anserinus.

The main idea is that the pes anserinus is formed by the tendons of three muscles that cross the medial knee and share a common insertion on the proximal, anteromedial tibia. Those three tendons are from the sartorius, gracilis, and semitendinosus. They come together just below the knee on the inner side of the tibia, creating the so‑called goosefoot (pes anserinus) tendon.

Understanding why this trio fits is helpful: each of these muscles approaches the medial knee from a different compartment—sartorius from the front, gracilis from the inner thigh, and semitendinosus from the back—yet their tendons converge to a single attachment on the tibia. This arrangement helps stabilize the medial knee and assists with knee flexion.

The other muscle groups listed don’t form this conjoined tendon on the medial tibia. Their tendons either insert elsewhere (for example, quadriceps tendons to the patella, or ankle-crossing tendons) or lie in different locations and directions, so they don’t create the pes anserinus.