In the stay apparatus, weight is distributed to the cannon bone and digits primarily through which structures?

In the stay apparatus, weight is distributed to the cannon bone and digits primarily through which structures?

• A. Patellar ligament
• B. Suspensory apparatus, distal sesamoidean ligaments, proximal sesamoid bones
• C. Biceps brachii and triceps
• D. Carpal bones and mortise

Answer: (B)

Weight distribution in the stay apparatus is carried by a ligamentous sling that runs from the cannon bone to the fetlock area and down into the hoof. The suspensory apparatus is the main load bearer, extending from the cannon bone to the proximal sesamoid bones at the fetlock. From there, the distal sesamoidean ligaments connect the sesamoids to the proximal and distal phalanges, channeling those forces into the hoof via the coffin joint. The proximal sesamoid bones act as pulleys within this system, redirecting tendon tension and helping spread the load. This setup allows the limb to support the animal with minimal muscular effort while standing.