Which structure prevents elbow flexion?

Which structure prevents elbow flexion?

• A. Collateral ligaments
• B. Lacertus fibrosus
• C. SDF check ligament
• D. DDF check ligament

Answer: (A)

The elbow in the stay apparatus is held in extension mainly by passive stabilizers that resist bending when the limb bears weight. The collateral ligaments run along the inner and outer sides of the elbow, connecting the humerus to the radius and ulna. When the animal tries to flex the elbow under load, these ligaments tighten and limit that movement, helping keep the joint extended with minimal muscular effort. The lacertus fibrosus helps transmit tension from the biceps to the extensor mechanism to aid extension, but it’s not the primary restraint against elbow flexion. The SDF and DDF check ligaments mainly restrict the flexion of the distal joints (carpus and fetlock), not the elbow itself.

The elbow in the stay apparatus is held in extension mainly by passive stabilizers that resist bending when the limb bears weight. The collateral ligaments run along the inner and outer sides of the elbow, connecting the humerus to the radius and ulna. When the animal tries to flex the elbow under load, these ligaments tighten and limit that movement, helping keep the joint extended with minimal muscular effort.

The lacertus fibrosus helps transmit tension from the biceps to the extensor mechanism to aid extension, but it’s not the primary restraint against elbow flexion. The SDF and DDF check ligaments mainly restrict the flexion of the distal joints (carpus and fetlock), not the elbow itself.