Where does “popliteal” come from?

I appreciate the detailed instructions, but I notice a significant issue: the etymology chain provided (English -al > English aldehyde > German Aldehyd) does not connect to the headword "popliteal." Popliteal is an anatomical adjective relating to the area behind the knee. Its actual etymology traces to Latin poplēs (back of the knee), not through aldehyde terminology. Could you clarify whether: 1. The headword should be different (perhaps "aldehyde")? 2. The etymology chain is correct for "popliteal"? I want to write an accurate sentence, and these don't align.

popliteal (English): Of or pertaining to the popliteus