下か腿たい三さん頭とう筋きん

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Meanings

1

noun

triceps surae muscle; calf triceps

anatomy

Anatomical term for the muscle group at the back of the lower leg, consisting of the gastrocnemius and soleus muscles.

下below, down, descend

腿thigh, femur

三three

頭head, counter for large animals

筋muscle, sinew, tendon

腓ひ腹ふく筋きん
腓腹筋 is the gastrocnemius, the superficial calf muscle; 下腿三頭筋 is the entire triceps surae group including the soleus.
ヒラメ筋きん
ヒラメ筋 is the soleus muscle, the deeper part of the calf; together with the gastrocnemius it forms the 下腿三頭筋.

Compound of 下腿 (lower leg), 三 (three), 頭 (head), and 筋 (muscle), referring to the three-headed muscle of the calf.