Which structure forms the sling apparatus axially?

• A. Proximal cruciate
• B. Interdigital ligament
• C. Distal cruciate
• D. Navicular bone

Answer: (C)

The axial sling around the distal phalanx is formed by the distal sesamoidean ligaments, especially the distal cruciate ligaments. These ligaments cross behind the navicular bone and wrap around the distal phalanx, linking it to the proximal structures so that weight is transmitted along the limb’s axis. This creates the supportive axial sling that holds the distal phalanx in proper alignment. The proximal cruciate ligament, interdigital ligaments, and the navicular bone itself don’t form this axial sling in the same way.