Fibularis longus:
- Originates on the lateral tibial condyle, head and proximal lateral fibula, and wraps under the foot
- Inserts on the base of the first metatarsal and medial cuneiform
- Everts and plantar flexes the foot.
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Leg - Lateral
Key actions of the anterior and lateral compartment muscles:
- Dorsiflexion — pull the dorsal surface (aka, top) of your foot towards the anterior leg to demonstrate this action.
- Plantar flexion — push the ventral surface (aka, sole) of your foot towards the posterior leg to demonstrate this action.
- Eversion — turn the ventral surface of your foot to face laterally to demonstrate this action.
- Inversion — turn the ventral surface of your foot to face medially (towards the midline of the body) to demonstrate this action.
Lateral compartment leg muscles:
These muscles evert and plantar flex the foot; plantarflexion points the toes away from the shin.
Lateral compartment muscles are innervated by the superficial fibular nerve.
Fibularis brevis:
- Originates on the distal lateral fibula (and intermuscular septa)
- Inserts on the base of the fifth metatarsal
- Everts and plantar flexes the foot.
Fibularis longus:
- Originates on the lateral tibial condyle, head and proximal lateral fibula, and wraps under the foot
- Inserts on the base of the first metatarsal and first cuneiform
- Everts and plantar flexes the foot.
