What are sesamoid bones in the right foot?

The same : As sesamoid bones in the left foot. There are two small bones that sit under the first metatarsal head. They help the flexor tendon of the big toe function. Since they are small bones they are difficult to heal if they are fractured.

Bones below the big: The normal sesamoid bones are two bonus to that are below the first metatarsal head below the big toe joint and they are in both feet. There are other accessory bones that are called the sesamoid in different parts of the foot. One is behind the outside of your foot.