The upper part of the foot has occasionally been named the “saddle” as it is thought to look like the back of the horse where the saddle might go. You can find a distinct deformity or bump that could develop on the top of the feet, that is why this is sometimes termed a Saddle Bone. https://fitofithealth.com/saddle-bone-deformity-throw-the-kitchen-sink-at-it/