Many parts of the lower extremity have parts with similar names and functions as parts in the upper extremity. Which part ONLY exists in the lower extremity?

The menisci are crescent-shaped pads of cartilage in the knee, a joint in the lower extremity. Labra occur in both the shoulder and hip, phalanges are the bones of both fingers and toes, and collateral ligaments occur in joints such as the elbow and knee. Therefore, the meniscus is the choice associated only with the lower extremity here.

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