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The Fibularis Longus is located in the Lateral Compartment of the (lower) leg. The muscles in the lateral compartment are:
- Fibularis longus
- Fibularis brevis
- Proximal lateral fibula to the first cuneiform and first metatarsal.
- The fibularis longus attaches proximally onto the proximal 1/2 of the lateral fibula.
- Everts (Pronates) the foot at the subtalar joint.
- Plantarflexes the foot at the ankle joint.
- The fibularis longus and tibialis anterior are named together as the stirrup muscles because they both attach onto the first cuneiform and first metatarsal and support the foot like a stirrup.
- The fibularis longus used to be named the peroneus longus; it was renamed at an Anatomy Congress in 1999.
- Eversion is the principal cardinal-plane (frontal-plane) component of the oblique-plane motion pattern of pronation.