Where does “最長筋” come from?

最長筋 (Japanese) comes from Japanese 最長, from Japanese 長, from Middle Chinese 長.

最長筋 (Japanese): a longissimus muscle

Definitions

  1. a longissimus muscle

Ancestry of “最長筋”, step by step

最長筋 traces back through two separate lines of ancestry.

via Japanese 最長

StepLanguageWordMeaning
1Japanese最長the longest
2Japanese長chief, head, leader; strong point; major
3Middle Chinese長—

via Japanese 筋

StepLanguageWordMeaning
1Japanese筋muscle; tendon; road
Every word from Middle Chinese 長 →Every word from Japanese 長 →Every word from Japanese 最長 →