The top of the foot has from time to time been named the “saddle” as it is thought to resemble the back of the horse where the saddle might be placed. You can notice a distinct deformity or bump that could occur on the upper surface of the feet, that is why this is occasionally termed a Saddle Bone. https://fitofithealth.com/saddle-bone-deformity-throw-the-kitchen-sink-at-it/