Which muscle is specifically involved in dorsiflexion and eversion of the foot?

The peroneus tertius muscle plays a crucial role in both dorsiflexion and eversion of the foot. This muscle originates from the lower leg, specifically from the anterior part of the fibula, and its tendon inserts into the fifth metatarsal bone. When the peroneus tertius contracts, it facilitates the upward movement of the foot (dorsiflexion) and also turns the foot outward away from the midline (eversion).

It's important to note that while other muscles, such as the peroneus brevis and gastrocnemius, are involved in the movement of the foot, they do not contribute to both dorsiflexion and eversion in the same way. The gastrocnemius, for instance, primarily functions in plantarflexion, and the peroneus brevis mainly assists with eversion but does not equip the capability for dorsiflexion. The Achilles tendon, being a tendon rather than a muscle, serves as a connection for the gastrocnemius and soleus muscles to the heel, further emphasizing that it does not perform these specific movements itself. Therefore, the peroneus tertius is the distinct muscle responsible for the combined action of dorsiflexion and