Which statement best describes the Lacertus fibrosus?

Which statement best describes the Lacertus fibrosus?

• A. It connects the biceps brachii to the extensor carpi radialis
• B. It connects SDF muscle to the distal radius
• C. It prevents elbow flexion
• D. It prevents carpal extension

Answer: (A)

The lacertus fibrosus is a broad, fibrous extension of the distal biceps tendon that fans out across the front of the elbow and anchors into the forearm fascia, blending with nearby structures such as the extensor carpi radialis region. This connection to the extensor carpi radialis helps transmit the force generated by the biceps during elbow flexion into the forearm and provides a stable linkage between the flexor and extensor compartments, helping to distribute load and prevent bowstringing of the tendon. In short, it connects the biceps brachii tendon to the extensor carpi radialis, enabling coordinated forearm action.

The lacertus fibrosus is a broad, fibrous extension of the distal biceps tendon that fans out across the front of the elbow and anchors into the forearm fascia, blending with nearby structures such as the extensor carpi radialis region. This connection to the extensor carpi radialis helps transmit the force generated by the biceps during elbow flexion into the forearm and provides a stable linkage between the flexor and extensor compartments, helping to distribute load and prevent bowstringing of the tendon. In short, it connects the biceps brachii tendon to the extensor carpi radialis, enabling coordinated forearm action.