This muscle is responsible for the thumb's abduction, and also plays a role in opposition of the thumb. There was no evidence of neurological or vascular deficit. Blood supply On this page I will give you all the info you need, to successfully relieve these muscles and the pain that is caused by them. Besides marked loss of active excursion of the thumb is noted. You can relieve these muscles as well as your pain with a simple, yet effective self-massage. The abductor pollicis brevis is a hand muscle which controls some of the movement of the thumb. The thenar musculature consists of the abductor pollicis brevis (APB), opponens pollicis, and flexor pollicis brevis—all of which arise from the flexor retinaculum (9,10). To kick up the difficulty, use a rubber band to strengthen the abductor pollicis brevis. The flexor pollicis brevis has the most distal origin off the flexor retinaculum. Stabilize – the hand. Tenosynovitis and tendinosis of the abductor pollicis longus (APL) and extensor pollicis brevis (EPB) tendons is called de Quervain’s tenosynovitis. Strength Testing: Position – the forearm in supination. Palpation: Palpate thenar musculature, the abductor pollicis brevis is the most superficial muscle and can be felt superficial and slightly more ulnar to the underlying opponens pollicis muscle. Abductor pollicis brevis is the most lateral and the most superficial of thenar muscles, located underneath the skin. Finkelstein’s test was positive suggesting de Quervain’s disease. Abductor pollicis longus lies close to the radial nerve. The main function of abductor pollicis brevis is the abduction of the thumb at the carpometacarpal joint. Strain of extensor muscle, fascia and tendon of left thumb at wrist and hand level, initial encounter. Contract your abductor pollicis brevis by trying to move your thumb out and away from your thumb, but continue to hold it in position with your free hand. First described by Swiss surgeon Fritz de Quervain in 1895, 1 this condition is commonly encountered as an overuse injury. The abductor pollicis longus muscle is innervated by the posterior interosseous nerve, which is a continuation of the deep branch of the radial nerve after it passes through the supinator muscle. It runs from the scaphoid and trapezium bones, and from the flexor retinaculum to the proximal phalanx of thumb. The posterior interosseous nerve is derived from spinal segments C7 & C8. S66-Injury of muscle, fascia and tendon at wrist and hand level › 2021 ICD-10-CM Diagnosis Code S66.212A; 2021 ICD-10-CM Diagnosis Code S66.212A. On examination patient had severe tenderness and swelling over the tendons of Extensor Pollicis Brevis and Abductor Pollicis Longus in the wrist. Adding a Rubber Band. Hold the contraction for five to 15 seconds, then switch hands. Opponens & Adductor Pollicis: Pain & Trigger Points. The opponens and adductor pollicis are the main troublemakers in thumb pain.