Which muscles are involved in the inversion movement of the foot?

The inversion movement of the foot involves turning the sole inward so that the medial edge of the foot lifts. The tibialis posterior and tibialis anterior are primary movers in this action.

The tibialis posterior, located deep in the calf, plays a vital role in supporting the arch of the foot and assists in inversion by pulling the heel inward. The tibialis anterior, situated in the front of the lower leg, also contributes to this motion by dorsiflexing the ankle and aiding in the inward rotation of the foot.

The flexor digitorum longus, while primarily responsible for flexing the toes, can also assist in inversion indirectly due to its anatomical positioning and adjacent musculature. This is particularly relevant since the muscles that control foot movements often work in synergy to achieve coordinated motion.

In contrast, the other options include muscles that primarily assist with eversion or do not significantly contribute to inversion. For example, peroneus longus and peroneus brevis are responsible for eversion of the foot, moving it outward and away from the midline, which is the opposite of inversion. Therefore, the first choice accurately reflects the main muscles involved in the inversion movement of the foot.