Which structure forms the sling apparatus axially?

Which structure forms the sling apparatus axially?

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

Answer: (B)

Understanding the navicular (distal sesamoid) apparatus helps here. The coffin bone is held in place by a sling formed by ligaments that wrap around the distal phalanx and deep digital flexor tendon. The part that runs along the axis of the digit, providing the main axial support, is the distal cruciate ligament. It forms the central, axial component of the sling around the coffin bone. The proximal cruciate contributes to the surrounding support but is not the primary axial element. The interdigital ligament is between digits and not part of this sling, and the navicular bone is the bone within the system, not the structure that forms the sling itself.

Understanding the navicular (distal sesamoid) apparatus helps here. The coffin bone is held in place by a sling formed by ligaments that wrap around the distal phalanx and deep digital flexor tendon. The part that runs along the axis of the digit, providing the main axial support, is the distal cruciate ligament. It forms the central, axial component of the sling around the coffin bone. The proximal cruciate contributes to the surrounding support but is not the primary axial element. The interdigital ligament is between digits and not part of this sling, and the navicular bone is the bone within the system, not the structure that forms the sling itself.