Arcade of Frohse

Anatomical structure in the forearm

Arcade of Frohse

The Arcade of Frohse, also known as the supinator arch, is an anatomical structure located in the forearm. It is a fibrous arch formed by the proximal edge of the superficial layer of the supinator muscle. This structure is clinically significant as it is a common site of compression of the posterior interosseous nerve, a branch of the radial nerve.

Arcade of Frohse location in the forearm

Anatomy

The Arcade of Frohse is situated in the proximal forearm, where the radial nerve divides into its superficial and deep branches. The deep branch, known as the posterior interosseous nerve, passes through the Arcade of Frohse as it enters the supinator muscle. The arcade is formed by the fibrous band of the supinator muscle, which is part of the muscle's origin from the lateral epicondyle of the humerus and the radial collateral ligament.

Function

The primary function of the Arcade of Frohse is to provide a passageway for the posterior interosseous nerve as it innervates the extensor muscles of the forearm. These muscles are responsible for the extension of the wrist and fingers.

Clinical Significance

The Arcade of Frohse is the most common site of compression of the posterior interosseous nerve, leading to a condition known as radial tunnel syndrome. This condition is characterized by pain and weakness in the forearm and hand, particularly affecting the ability to extend the wrist and fingers. Diagnosis is typically made through clinical examination and may be confirmed with electromyography or nerve conduction studies.

Surgical Considerations

In cases where conservative treatment for radial tunnel syndrome is ineffective, surgical intervention may be necessary. The procedure involves decompressing the posterior interosseous nerve by releasing the Arcade of Frohse. This is done to alleviate pressure on the nerve and restore normal function.

Related Pages

• Radial nerve
• Supinator muscle
• Radial tunnel syndrome
• Posterior interosseous nerve