Distal stay apparatus is the same between the pelvic and thoracic limbs.

• A. False
• B. Sometimes
• C. Not applicable
• D. True

Answer: (D)

The distal stay apparatus is the same in both fore and hind limbs because it serves the same job: keep the distal joints (fetlock, pastern, and coffin) extended when the limb bears weight. The key players—suspensory ligament with its proximal sesamoidean ligaments, the flexor tendons (superficial and deep digital flexors), and the associated check ligaments and connective tissues—work together in both limbs to oppose the tendency to collapse into flexion. When the limb bears weight, this coordinated tension locks the joints in a stable line, allowing the animal to stand with minimal muscular effort. Differences in size or tension exist to suit each limb’s load, but the basic arrangement and mechanism are the same, so the statement is true.