Astragalus

The right astragalus. A, Upper surface. B, Under surface. Labels: 1, groove for flex, long, hallucis; 2, internal tubercle; 3, trochlear surface for tibia; 4, body; 5, for articulation with internal malleolus; 6, head; 7, for articulation with internal malleolus; 8, neck; 9, for articulation with external malleolus; 10, surface against which the inferior tibio fibular ligament rests; 11, external tubercle; 12, external tubercle; 13, posterior, middle, and anterior facets for os calcis; 14, for articulation with navicular; 15, surface resting on inferior calcaneo-navicular ligament; 16, interosseous groove; 17, internal tubercle; 18, groove for the flexor longus hallucis.

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