Extensor indicis et medii communis muscle

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Extensor indicis et medii communis muscle

The extensor indicis et medii communis muscle is a muscle located in the forearm. It is part of the extensor compartment of the forearm and is involved in the extension of the index finger and the middle finger.

Anatomy

The extensor indicis et medii communis muscle originates from the posterior surface of the ulna and the interosseous membrane of the forearm. It inserts into the extensor expansion of the index and middle fingers.

Origin

• Posterior surface of the ulna
• Interosseous membrane of the forearm

Insertion

• Extensor expansion of the index finger
• Extensor expansion of the middle finger

Function

The primary function of the extensor indicis et medii communis muscle is to extend the index finger and the middle finger. It assists in the extension of the wrist and helps in the coordination of finger movements.

Innervation

The muscle is innervated by the posterior interosseous nerve, which is a branch of the radial nerve.

Blood Supply

The blood supply to the extensor indicis et medii communis muscle is provided by the posterior interosseous artery, a branch of the common interosseous artery.

Clinical Significance

Injuries or conditions affecting the extensor indicis et medii communis muscle can lead to difficulties in extending the index and middle fingers. This can impact hand function and dexterity.

Related Muscles

• Extensor digitorum muscle
• Extensor indicis muscle
• Extensor digiti minimi muscle

See Also

• Forearm muscles
• Extensor compartment of the forearm
• Radial nerve