Which muscle covers the outer side of the calf and inverts the foot while turning it outward?

The peroneus longus muscle is responsible for covering the outer side of the calf and plays a key role in the movement of inverting the foot while also helping to turn it outward. This muscle originates from the upper part of the fibula, runs alongside the lower leg, and inserts on the medial side of the foot.

Its primary functions include eversion of the foot (turning the sole outward) and assisting in the stabilization of the arch of the foot. This is particularly important during activities such as walking or running, where balance and proper foot mechanics are crucial.

Knowing this muscle's function is essential for nail technicians as it helps understand overall foot health and mechanics, which is important for proper pedicures and consideration of foot-related issues. The other muscles listed, such as the gastrocnemius and soleus, primarily function in plantar flexing the foot and are not involved in the inversion and outward turning of the foot. The peroneus brevis, while also involved in foot eversion, is located deeper and serves a slightly different role compared to the peroneus longus.