peroneus tertius

noun
peroneus ter·​ti·​us | \-ˈtər-shē-əs \

Medical Definition of peroneus tertius 

: a branch of the extensor digitorum longus muscle that arises especially from the lower portion of the fibula, inserts on the dorsal surface of the base of the fifth metatarsal bone, and flexes the foot dorsally and assists in everting it

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