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Fibularis (Peroneus) Tertius
Region: Leg & Foot Muscles · All leg & foot muscles
Fibularis (Peroneus) Tertius at a glance
| Origin | Front surface of the lower fibula (with extensor digitorum longus) |
|---|---|
| Insertion | Top of the base of the fifth metatarsal |
| Actions | Turns the sole outward (eversion); Helps lift the foot upward (dorsiflexion) |
| Nerve supply | Deep fibular nerve (L5–S1) |
◆ Good to know
A uniquely human muscle linked to upright walking; despite its name it belongs to the front (extensor) compartment, not the fibular muscles of the side compartment.
More Leg & Foot Muscles
Please note: This page is an anatomy education summary for students and curious readers, not medical advice. Attachment points are given in their classic short form; individual anatomy varies, and detailed dissection-level descriptions belong in an anatomy atlas.