The lower leg muscles are primarily divided into two groups: the anterior (front) and posterior (back) compartments. The main muscles in the anterior compartment include the tibialis anterior, which helps lift the foot, and the extensor digitorum longus, which extends the toes. These muscles are essential for activities like walking and running. In the posterior compartment, the key muscles are the gastrocnemius and soleus, which together form the calf. These muscles are responsible for plantar flexion, allowing the foot to point downward. They play a crucial role in movements such as jumping and pushing off the ground.