Right fibularis longus: Attachments, Function & 3D

Educational draft · anatomical review pendingSources checked 19 October 2026. Prepared with AI assistance; not yet reviewed by a qualified anatomist. Not for diagnosis or treatment.

Model side: Right
Compartment: Lateral leg
Distal destination: Medial foot
Motor nerve: Superficial fibular nerve

Identify fibularis longus

The more superficial lateral-leg muscle, with a tendon that continues beneath the foot.

Its distal route differs from brevis: longus continues across the plantar foot instead of ending at the fifth metatarsal.

Sources: Lateral-leg anatomy tables

Around the outer ankle

From the upper lateral fibula, its tendon crosses the sole to the medial cuneiform and base of the first metatarsal.

Both lateral tendons pass behind the lateral malleolus, held by fibular retinacula. These retaining bands are absent from the viewer; gaps between the surfaces are not an anatomical tunnel.

Sources: Lateral-leg anatomy tables · Anterior leg & foot lab manual

Eversion and plantar flexion

Longus and brevis evert the foot and assist plantar flexion. Tertius also contributes to eversion but assists dorsiflexion instead.

The model is static. Camera rotation does not move the joints, and these surfaces cannot predict strength, stability or an individual's range of motion.

Sources: Lateral-leg anatomy tables

Innervation

The superficial fibular (peroneal) nerve supplies longus and brevis; tertius receives the deep fibular nerve.

Neither nerve, its branches nor the supplying vessels are shown in this study.

Sources: Lateral-leg anatomy tables

Read the model

Explore right fibularis longus in 3D

Follow the selected surface. Start with Oblique and rotate toward the outer ankle. Restore context, then follow the narrow distal surface toward the sole. Rotate underneath to compare its direction with the first metatarsal.
Compare its destination. Show context restores the 31 bones and 21 muscle parts of this side. The related bone link below opens a separate study; the attachment site itself is not a separate mesh.
Return to the lateral pair. The regional lower-leg view contains the tibia, fibula and thirteen muscle parts but no foot bones. Use the whole-leg context on this structure page to compare the distal route. Right lateral-leg guides →

What this model can—and cannot—show

BodyParts3D provides this right-sided surface model, not every anatomical variant. Colors distinguish structures; they are not tissue textures.

The plantar continuation shares the muscle color. It is not a separately selectable tendon, and the mesh does not reveal tendon sheaths or a complete soft-tissue tunnel.

Fibular retinacula, tendon sheaths, joint cartilage and separate ligaments are absent. Muscle and tendon portions use the same color; internal fibers are not represented.

Left and right guides share general anatomy but open distinct source-identified meshes. The models do not capture every anatomical variant.

A section tool is not available for this structure. The surface model does not reveal internal tissue architecture or represent a medical scan.

Sources and editorial status

This guide uses independently written explanations with links to the evidence behind them. Source checking and specialist anatomical review are separate steps; the latter is still pending.

TTUHSC El Paso — Anterior & lateral leg and foot anatomy tables
Longus and brevis attachments, actions, superficial fibular nerve supply and comparison with tertius. Introductory attachment summaries.
TTUHSC El Paso — Anterior leg & foot lab manual
Lateral-compartment tendons behind the lateral malleolus and the role of fibular retinacula. The viewer is not a substitute for dissection.

3D geometry and its separate license are credited beneath the viewer. References do not imply endorsement of this site.

Right fibularis longus