Which option is not a described feature of the thoracic limb?

Which option is not a described feature of the thoracic limb?

• A. The thoracic limb bears more weight
• B. The thoracic limb has more check ligaments
• C. The thoracic limb bears less weight
• D. The palmar ligament holds accessory bones to the hock

Answer: (C)

The stay apparatus of the forelimb is organized so the limb carries most of the body weight and remains extended with minimal muscular effort. In standing horses, the forelimbs bear the majority of the weight, and several check ligaments help hold the carpus and related joints in extension, preventing collapse and allowing the animal to rest with little muscular work. Because of this, describing the thoracic limb as bearing less weight would be opposite to its true role in weight support. The forelimb’s load-bearing role and the presence of check ligaments fit with how the stay apparatus functions to stabilize the limb. The note about the palmar ligament tying accessory bones to the hock refers to hind-limb anatomy, not the thoracic limb, so it does not describe the forelimb’s stay apparatus.

The stay apparatus of the forelimb is organized so the limb carries most of the body weight and remains extended with minimal muscular effort. In standing horses, the forelimbs bear the majority of the weight, and several check ligaments help hold the carpus and related joints in extension, preventing collapse and allowing the animal to rest with little muscular work. Because of this, describing the thoracic limb as bearing less weight would be opposite to its true role in weight support. The forelimb’s load-bearing role and the presence of check ligaments fit with how the stay apparatus functions to stabilize the limb. The note about the palmar ligament tying accessory bones to the hock refers to hind-limb anatomy, not the thoracic limb, so it does not describe the forelimb’s stay apparatus.