Fibularis longus and brevis are primarily described as which type of muscles?

Fibularis longus and brevis are primarily described as which type of muscles?

• A. Dorsiflexors and invertors
• B. Plantar flexors and pronator/evertors
• C. Hip abductors
• D. Knee extensors

Answer: (B)

Fibularis longus and brevis act mainly to plantarflex the ankle and evert the foot. Located in the lateral compartment of the leg, their contraction points the sole downward and rolls the sole outward, helping stabilize the foot arches during gait. They are not primary dorsiflexors (those are in the front of the leg) and they do not invert the foot (inversion is done by muscles like tibialis anterior and tibialis posterior). They also aren’t hip abductors or knee extensors, which move other joints. So describing them as plantar flexors and pronator/evertors best captures their primary actions.

Fibularis longus and brevis act mainly to plantarflex the ankle and evert the foot. Located in the lateral compartment of the leg, their contraction points the sole downward and rolls the sole outward, helping stabilize the foot arches during gait. They are not primary dorsiflexors (those are in the front of the leg) and they do not invert the foot (inversion is done by muscles like tibialis anterior and tibialis posterior). They also aren’t hip abductors or knee extensors, which move other joints. So describing them as plantar flexors and pronator/evertors best captures their primary actions.