Causes of Swelling & Throbbing Behind the Knee
The area at the back of the knee is referred to by the anatomical term “popliteal fossa,” due to the presence of the flat triangular muscle at the back of the knee called the popliteus. "Fossa" is an anatomical term used to describe a concave depression, such as at the back of the knee, or the inside of the elbow.
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