Triceps surae - Hard triceps surae

Japanese: 下腿三頭筋 - かたいさんとうきん

The calf is a muscle located on the back of the lower leg that forms the calf. It is made up of the gastrocnemius and soleus muscles, the former with two heads originating from the lower part of the femur, and the latter with one head originating from the back of the tibia, giving it its three heads in total. They form the bulge of the calf. At the bottom, the two join together to form the Achilles tendon, which attaches to the calcaneus. It is a powerful flexor of the foot that presses the foot against the floor and helps with standing on its toes and taking off when walking, running, or jumping.

Source : Heibonsha Encyclopedia About MyPedia Information

Japanese:

下腿後面にあって〈ふくらはぎ〉をつくる筋肉。腓腹(ひふく)筋とひらめ筋からなり，前者は２頭で大腿骨下部から，後者は１頭で下腿骨後面から起こり，計３頭なのでこの名がある。ふくらはぎのふくらみをつくる。下方は両者合してアキレス腱(けん)となり踵(しょう)骨につく。足の強力な屈筋で，足を床に押しつけ，爪(つま)立ち，また歩行，走行，跳躍に際して踏みきることに役立つ。

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