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See scaphoid bone.
na·vic·u·lar bone(nă-vik'yū-lăr bōn)
A bone of the tarsus on the medial side of the foot articulating with the head of the talus, the three cuneiform bones, and occasionally the cuboid.
boat-shaped; applied to certain bones, such as the navicular bones of the horse's foot and human ankle.
a specially carved block of wood in which a horse's foot is lodged to enable a radiograph of the navicular bone to be taken at a suitable angle.
1. the distal sesamoid bone of a horse's foot; it lies on the palmar side of the coffin joint and serves to change the direction of the deep digital flexor tendon as it inserts on the distal phalanx. Its palmar surface is covered with fibrocartilage, its dorsal surface with hyaline cartilage and its dorsal surface is pocked with a row of nutrient foramina.
2. (rare) the central tarsal bone.
navicular bursa inflammation
in the horse may contain Brucella abortus; a cause of intermittent lameness.
a chronic degeneration of the navicular bone in which there is damage to its flexor surface and the overlying flexor tendon in the front feet of horses. There may be an accompanying navicular bursitis and osteophyte formation. Characterized by intermittent lameness and pointing when the animal is standing. Called also podotrochlitis.