The sling apparatus inserts on which structure?

• A. Distal phalanx
• B. Proximal phalanx
• C. Navicular bone
• D. Distal sesamoid

Answer: (A)

The sling apparatus is the tendon–ligament system that forms a supportive sling around the end of the digit to hold the coffin bone in place as weight is borne. Its attachment point is the distal phalanx (the coffin bone), which is the structure the sling needs to stabilize within the hoof capsule. The deep digital flexor tendon passes over the navicular area, but the sling’s insertions are on the distal phalanx, not on the navicular bone or the proximal phalanx. In short, this setup anchors the end bone of the digit to secure proper alignment during movement.