crus 
(krs, krŭs)
(krs, krŭs)n. pl. cru·ra (krrə)
1. The section of the leg or hind limb between the knee and foot; shank.
2.
a. A leglike part.
b. A body part consisting of elongated masses or diverging bands that resemble legs or roots.
[Latin crūs, crūr-, leg.]