Lower limb

Fibularis longus

Musculus fibularis longus

Origin

Lateral condyle of the tibia and the head, proximal two-thirds of the lateral fibula

Insertion

Base of the first metatarsal bone and the medial cuneiform bone (plantar side)

Function

Eversion of the foot, supports the transverse arch of the foot and assists plantarflexion

Innervation

Superficial fibular (peroneal) nerve, L5-S1

Movement & chain

The tendon runs beneath the foot and pulls the first metatarsal bone downward, giving it a key role in stabilizing the arch of the foot during push-off.

Palpation

Readily palpable proximally around the fibular head; the tendon can be followed behind the lateral malleolus.

Clinical

Overuse causes symptoms on the lateral lower leg in runners; peritendinitis occurs behind the lateral malleolus.

Segmental innervation

L5-S1, via the superficial fibular nerve; part of the myotome testing pattern for eversion of the foot.

In clinical practice

Diabetic foot inspection and pressure ulcer prevention; monitor for friction points from footwear or bedding and ensure correct anti-embolism stocking fit.

Region in the model

Lower limb