What is one of the actions of the extensor digitorum longus?

The extensor digitorum longus is primarily responsible for the extension of the toes, specifically the lateral four toes (the second to fifth toes). This muscle is located in the anterior compartment of the leg and its tendons insert into the distal phalanges of these toes. When the muscle contracts, it straightens the toes, which is essential for activities like walking and running, as it helps facilitate the push-off phase of gait.

The other functions that were listed do not pertain to the action of the extensor digitorum longus: for example, plantarflexion of the ankle is typically performed by muscles located in the posterior compartment of the leg, like the gastrocnemius and soleus. Flexing the knee involves different muscle groups primarily around the thigh, while foot abduction is facilitated by muscles of the lateral compartment and is not a function of the extensor digitorum longus.