soleus muscle
Anatomical term for the calf muscle beneath the gastrocnemius; named for its resemblance to a flatfish (ヒラメ).
The soleus muscle is a muscle located deep in the calf.
I injured my soleus muscle while running.
Standard kanji-kana mixed spelling for the soleus muscle.
Katakana variant of the first part, sometimes used in anatomical contexts.
Rarely used kanji form; 平目 means 'flatfish' (flounder), referencing the muscle's shape.
From ひらめ (平目・比目魚, 'flatfish, flounder') + 筋 (きん, 'muscle'), so called because the muscle's shape resembles a flatfish.