This pain intensifies because the extensor carpi ulnaris has an injury near the elbow area and as a person moves their arm, the muscle contracts, thus causing it to move over the medial epicondyle of the humerus. The pain worsens when a person moves their wrist with force. Some symptoms of an extensor carpi ulnaris injury include pain when shaking hands or when squeezing/gripping an object.
This injury occurs in people who participate in activities requiring repetitive arm, elbow, and wrist, especially when they are tightly gripping an object.
Injuries Ī common injury to the extensor carpi ulnaris is tennis elbow. It would therefore be paralyzed in an injury to the posterior cord of the brachial plexus. Innervation ĭespite its name, the extensor carpi ulnaris is innervated by the posterior interosseous nerve (C7 and C8), the continuation of the deep branch of the radial nerve. In this case it would be described as ulnaris lateralis. The muscle is a minor extensor of the carpus in carnivores, but has become a flexor in ungulates. The extensor carpi ulnaris extends the wrist, but when acting alone inclines the hand toward the ulnar side by its continued action it extends the elbow-joint. It originates from the lateral epicondyle of the humerus and the posterior border of the ulna, and crosses the forearm to the ulnar (medial) side to insert at the base of the 5th metacarpal. The extensor carpi ulnaris acts to extend and adduct at the carpus/wrist from anatomical position.īeing an extensor muscle, extensor carpi ulnaris is located on the posterior side of the forearm. Also, check out our extensive collection of medical mnemonics.In human anatomy, the extensor carpi ulnaris is a skeletal muscle located on the ulnar side of the forearm. You may also like these similar articles.
EXTENSOR COMPARTMENTS HAND UPDATE
If we missed any points, please let us know in the comments below! We are continuously striving to improve our notes and articles, and will update our posts based on your valuable feedback. CompartmentĪlso remember this important table about the structures passing superficial to and deep under extensor retinaculum. The following table summarizes the Structures passing through various compartments beneath the extensor retinaculum of wrist. Snapping ECU: ECU tendon subluxates producing painful “snap” during extension and supination and reduces with pronation. Lister’s tubercle separates Compartment 2 from Compartment 3.Ĭompartment 3: EPL (Extensor Pollicis Longus)Ĭompartment 4: EDC (Extensor Digitorum Profundus radial) and EIP (Extensor Indicis Proprius ulnar) + Posterior interosseous nerve (PIN)Ĭompartment 5: EDM (Extensor Digiti Minimi)1st tendon to rupture in Vaughan-Jackson syndrome (commonly seen in Rheumatoid Arthritis – sequential atraumatic rupture of extensor tendons in hand starting from ulnar side and progressing radially)Ĭompartment 6: ECU (Extensor Carpi Ulnaris) The number of tendons passing through the compartments (radial to ulnar) can be remembered using the mnemonic: 2-2-1-2-1-1.Ĭompartment 1: APL (Abductor Pollicis Longus radial frequently has multiple slips) and EPB (Extensor Pollicis Brevis ulnar) Remember: These form the lateral border of Anatomical Snuff box.ĭeQuervain’s tenosynovitis (modified Eichoff’s test or Finkelstein’s test) – most common extensor compartment tenosynovitisĬompartment 2: ECRL (Extensor Carpi Radialis Longus) and ECRB (Extensor Carpi Radilis Brevis) Intersection syndrome: the intersection (at an angle of around 60°) of the musculotendinous junctions of the first and second extensor compartment tendons leading to tenosynovitis of 2nd compartment due to friction from the overlying 1st compartment. These compartments contain tendons of muscles that pass from forearm to hand. The Extensor Zone VII (wrist) contains 6 extensor compartments comprising of 6 synovial sheath lined tunnels separated from each other by fibrous sheath.
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