Which action does the fibularis longus perform that helps maintain the lateral border of the foot?

Which action does the fibularis longus perform that helps maintain the lateral border of the foot?

• A. Inversion
• B. Eversion
• C. Plantarflexion
• D. Dorsiflexion

Answer: (B)

The action being tested is turning the sole outward. The fibularis longus is an everter of the foot (and also a plantarflexor), and its tendon travels under the foot to the plantar aspect of the medial side, where it helps support the arches. This eversion action stabilizes the lateral side of the foot and helps keep the lateral border in place during weight-bearing. Inversion, dorsiflexion, and plantarflexion are other movements not specifically focused on maintaining the lateral border, which is why eversion is the correct choice.

The action being tested is turning the sole outward. The fibularis longus is an everter of the foot (and also a plantarflexor), and its tendon travels under the foot to the plantar aspect of the medial side, where it helps support the arches. This eversion action stabilizes the lateral side of the foot and helps keep the lateral border in place during weight-bearing. Inversion, dorsiflexion, and plantarflexion are other movements not specifically focused on maintaining the lateral border, which is why eversion is the correct choice.