There are twenty-six  bones in the foot. Seven form the tarsus, or instep :

1. Os calcis,                        4. Cuboid,

2.  Astragalus,                    5. Inner, or first cuneiform,

3.   Scaphoid,                       6. Middle, or second cuneiform,

7. Outer, or third cuneiform.

The os calcis, or heel-bone, is the largest and strongest of the tarsal bones.

The astragalus is a large bone which fits into the os calcis behind and the scaphoid in front ; it also articulates with the inner and outer malleoli.

The scaphoid is on the inner side of the foot, between the astragalus and the cuneiform bones.

The cuboid is at the outer side of the foot, between the os calcis and the two outer metatarsal bones.

The cuneiform bones are wedge-shaped, and are between the scaphoid and three inner metatarsal bones.

There are five metatarsal bones, which articulate at their bases with the tarsal bones, and at their heads with the bones of the toes. There are fourteen phalanges, arranged as in the fingers.

There are two sesamoid bones in the tendons of the great toe and in other tendons of the foot.