What is the primary function of the tibialis anterior muscle?

The primary function of the tibialis anterior muscle is dorsiflexion of the foot. This muscle is located in the anterior compartment of the leg and is responsible for lifting the foot upwards at the ankle joint, which is essential for walking, running, and maintaining balance. Dorsiflexion allows the toes to clear the ground during the swing phase of gait and helps position the foot for heel strike when walking.

In contrast, plantarflexion refers to pointing the toes downward, which is primarily facilitated by muscles such as the gastrocnemius and soleus. Eversion and inversion involve movements of the foot at the subtalar joint. Eversion is the movement that turns the sole of the foot outward, while inversion turns it inward, which is mainly performed by the tibialis posterior and other muscles. Therefore, the tibialis anterior's role in dorsiflexion is distinct and crucial for proper function and mobility.