As the femoral artery reaches the space behind the knee (known as the "popliteal fossa"), it becomes the popliteal artery. Branches of this artery supply blood to the knee joint and to muscles in the thigh and calf. Many of its branches also join the connecting nerve network of the knee to help to provide alternative routes in the case of artery obstruction. The corresponding popliteal vein parallels the artery as it carries blood back to the heart.
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