Lacertus fibrosus prevents which flexion?

Lacertus fibrosus prevents which flexion?

• A. Carpal
• B. Elbow
• C. Shoulder
• D. Fetlock

Answer: (A)

Lacertus fibrosus is a fibrous band that links the biceps brachii tendon to the extensor carpi radialis tendon. In the Stay Apparatus, when the limb bears weight, tension in the biceps pulls this band and, via the extensor carpi radialis, helps keep the carpus extended. This action prevents flexion at the carpal joints, allowing the limb to support the body without the carpus collapsing. It doesn’t primarily control flexion at the elbow or shoulder, or the fetlock, which rely on other structures.

Lacertus fibrosus is a fibrous band that links the biceps brachii tendon to the extensor carpi radialis tendon. In the Stay Apparatus, when the limb bears weight, tension in the biceps pulls this band and, via the extensor carpi radialis, helps keep the carpus extended. This action prevents flexion at the carpal joints, allowing the limb to support the body without the carpus collapsing. It doesn’t primarily control flexion at the elbow or shoulder, or the fetlock, which rely on other structures.