Fibularis longus (Musculus fibularis longus)
Educational content only — not medical advice.
Anatomy
A superficial muscle on the fibular side whose tendon uniquely hooks behind the lateral malleolus then crosses the sole obliquely to the first metatarsal base — the only muscle looping fully around the foot.
Origin & insertion
Fibular head and proximal two-thirds of the shaft.
Action
Everts the foot and braces the transverse arch as a sling under the sole.
Innervation
Superficial peroneal nerve (L5–S1).
Clinical notes
Its retromalleolar groove is the ballet tendinitis site; pain behind the lateral malleolus is misdiagnosed as an ankle sprain, and the fibular tunnel at its head exposes its nerve to entrapment.
Related structures
Educational references
FAQ
What is the role of the Fibularis longus?
A superficial muscle on the fibular side whose tendon uniquely hooks behind the lateral malleolus then crosses the sole obliquely to the first metatarsal base — the only muscle looping fully around the foot.
Why is the Fibularis longus clinically important?
Its retromalleolar groove is the ballet tendinitis site; pain behind the lateral malleolus is misdiagnosed as an ankle sprain, and the fibular tunnel at its head exposes its nerve to entrapment.
Source & license
BodyParts3D, © The Database Center for Life Science licensed under CC Attribution 4.0 International (https://creativecommons.org/licenses/by/4.0/). license details