What is the primary action of the Extensor Hallucis Longus muscle?

The primary action of the Extensor Hallucis Longus muscle is extending the great toe. This muscle is located in the anterior compartment of the leg and plays a crucial role in the movement of the big toe by extending it at the metatarsophalangeal and interphalangeal joints. This action is vital for activities such as walking, running, and maintaining balance, particularly when the toes push off the ground during gait.

In addition to its primary action, the Extensor Hallucis Longus also contributes to dorsiflexion of the foot, which is the action of raising the foot upwards towards the shin. While it assists in dorsiflexion, its main role is in the extension of the great toe, distinguishing it from other muscles that may primarily focus on ankle stabilization or flexion. Understanding this specific function helps clarify the muscle’s importance in both mobility and stability during foot and toe movements.