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3. Cuboid

Another tarsal bone, the cuboid, is slightly cubical, as its name suggests. A rough upper or dorsal surface allows for ligament attachments. The plantar area on the underside of the bone has a deep groove to accommodate the tendon of the peroneus longus. The posterior surface of the cuboid is smooth and connects to the calcaneus at the calcaneocuboid joint. A small projection from this region supports the anterior portion of the calcaneus. The anterior surface of the cuboid forms the fourth and fifth tarsometatarsal joints. The medial area is broad and meets the navicular bone and the third cuneiform.

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