Fibularis tertius

Definition

The fibularis tertius is a small muscle located in the lower leg that is involved in the dorsiflexion and eversion of the foot. It originates from the lower part of the fibula and inserts into the base of the fifth metatarsal bone on the foot.

Related terms

Dorsiflexion:

The action of raising the foot upwards towards the shin, decreasing the angle between them.

Eversion:

The movement of rotating the sole of the foot outward, away from the midline of the body.

Metatarsal bones: The five long bones located in between the tarsal bones of the hind- and mid-foot and the phalanges of the toes