in the foot, the proximal phalanges have a body that is compressed from side to side, convex above, and concave below. the base is concave, and the head presents a trochlear surface for articulation with the second phalanx. the middle are remarkably small and short, but rather broader than the proximal. the distal phalanges, as compared with the distal phalanges of the finger, are smaller and are flattened from above downward; each presents a broad base for articulation with the corresponding bone of the second row, and an expanded distal extremity for the support of the nail and end of the toe.