The Navicular Bone (os naviculare pedis; scaphoid bone) is situated at the medial side of the tarsus, between the talus behind and the cuneiform bones in front.
- The anterior surface is convex from side to side, and subdivided by two ridges into three facets, for articulation with the three cuneiform bones.
- The posterior surface is oval, concave, broader laterally than medially, and articulates with the rounded head of the talus.
- The dorsal surface is convex from side to side, and rough for the attachment of ligaments.
- The plantar surface is irregular, and also rough for the attachment of ligaments.
- The medial surface presents a rounded tuberosity, the lower part of which gives attachment to part of the tendon of the Tibialis posterior.
- The lateral surface is rough and irregular for the attachment of ligaments, and occasionally presents a small facet for articulation with the cuboid bone.
The navicular articulates with four bones: the talus and the three cuneiforms; occasionally with a fifth, the cuboid.