The weight of the trunk is positioned directly over which joint?

• A. Elbow
• B. Shoulder
• C. Carpus
• D. Stifle

Answer: (A)

The main idea here is how the body’s weight is carried through the forelimb when an animal stands still. The weight of the trunk is positioned so that the line of gravity passes directly over the elbow joint. This alignment lets the forelimb act like a sturdy column, enabling the stay apparatus to lock the limb in extension and support the body with minimal muscular effort. The shoulder sits higher up the limb and isn’t the point where the trunk’s weight centers during this standing posture, while the carpus and stifle are further along the limb or in the hind limb, not the primary load-bearing joint under the trunk in this context. So, the elbow is the joint directly under the trunk’s weight for stable standing.