The top of the foot has occasionally been named the “saddle” as it is believed to resemble the back of the horse wherever 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/