Inversion of the foot. Artwork of the muscles of the foot from above, with red arrows showing the direction of movement when inverting the foot. This is the motion that tilts the foot sideways so that the sole moves towards the midplane of the body. The opposite movement is eversion. Inversion is most commonly encountered when twisting the ankle. The muscles involved are the tibialis anterior and tibialis posterior. The nerve used is the tibial nerve. This is the left foot. For the right foot, see C016/6801.