Fibularis longus
In human anatomy, the fibularis longus (also known as peroneus longus) is a superficial muscle in the lateral compartment of the leg. It acts to tilt the sole of the foot away from the midline of the body (eversion) and to extend the foot downward away from the body (plantar flexion) at the ankle.
| fibularis longus | |
|---|---|
Animation | |
Mucous sheaths of tendons around right ankle, lateral aspect. (Tendon-sheath of fibularis longus labeled as peronaeus longus at bottom center.) | |
| Details | |
| Origin | proximal part of lateral surface of shaft of fibula and head of fibula |
| Insertion | first metatarsal, medial cuneiform |
| Artery | fibular (peroneal) artery |
| Nerve | superficial fibular nerve |
| Actions | plantarflexion, eversion, support arches |
| Antagonist | tibialis anterior muscle |
| Identifiers | |
| Latin | musculus fibularis longus |
| TA98 | A04.7.02.041 |
| TA2 | 2652 |
| FMA | 22539 |
| Anatomical terms of muscle | |
The fibularis longus is the longest and most superficial of the three fibularis (peroneus) muscles. At its upper end, it is attached to the head of the fibula, and its "belly" runs down along most of this bone. The muscle becomes a tendon that wraps around and behind the lateral malleolus of the ankle, then continues under the foot to attach to the medial cuneiform and first metatarsal. It is supplied by the superficial fibular nerve.
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