Which structure primarily transmits load from the fetlock to the distal limb during weight-bearing?

Which structure primarily transmits load from the fetlock to the distal limb during weight-bearing?

• A. Navicular apparatus.
• B. Distal sesamoidean ligaments.
• C. Interosseous ligament.
• D. Extensor carpi radialis.

Answer: (B)

In the stay apparatus, the load from the fetlock is transmitted down toward the distal limb primarily through the distal sesamoidean ligaments. These ligaments connect the distal sesamoid bones to the proximal and distal phalanges and pass around the navicular bone, forming the main link that carries weight from the fetlock through the pastern to the coffin bone. The navicular apparatus helps redirect and distribute forces around the coffin joint, but it is the distal sesamoidean ligaments that provide the main load transmission path. The interosseous (suspensory) ligament supports the fetlock against overextension, rather than being the primary conduit for transferring weight to the distal limb.