Fibularis Tertius
Leg & Ankle
A dorsiflexor/evertor often considered part of extensor digitorum longus — absent in about 8% of people with no functional consequence.
Function
Dorsiflexes and everts foot
Origin
Inferior anterior fibula and interosseous membrane
Insertion
Dorsal base of fifth metatarsal
Innervation
Deep fibular nerve (L5-S1)