A long, thin muscle on the inner thigh that runs from the pelvis to the knee and helps move the leg inward and forward.
From Latin 'gracilis' (slender), named by anatomists for the muscle's thin, elongated shape. Latin anatomical terminology became standard in medicine and biology in the 16th century.
The gracilis muscle is unique—it's the only muscle that crosses both the hip and knee joints, giving it unusual power for its size. Ballet dancers develop incredible gracilis strength!
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