For example, flexion of the middle and little fingers restricts extension of the ring finger MCP joint because the juncturae tendineae pulls the ring finger extensor tendon distally. Proximal to the metacarpal heads, juncturae tendineae connect the four tendons of the ED muscles, limiting their independent motion. The posterior (dorsal) wrist extensor compartments serve to enhance the efficiency and effectiveness of the wrist and finger extensors. – Extensor Indicis Proprius (EIP) Extensor tenosynovitis 5 – Extensor Digiti Minimi Vaughn-Jackson syndrome (initial) 6 – Extensor Carpi Ulnaris (ECU) ECU instability Dorsal Extensor compartments of the wrist See Also: De Quervain's tenosynovitis Wrist Extensor Anatomy – Extensor carpi Radialis longus (ECRL) Intersection syndromeģ – Extensor Pollicis Longus (EPL) Late rupture after closed treatment of distal radius fracture 4 – Extensor Digitorum Communis (EDC) – Extensor Pollicus Brevis (APL) De Quervain’s tenosynovitis 2 – Extensor Carpi Radialis Brevis (ECRB) See Also: Wrist Anatomy Extensor compartments of the wrist Compartment Tendons Associated Conditions 1 – Abductor Pollicus Longus (EPL) The mnemonic 2 2 1 2 1 1 can be used to remember the number of tendons in each compartment. Īs these tendons pass through the compartments, they are invested with synovial sheaths. extensor digitorum (ED) (four tendons) and extensor indicis (EI). extensor carpi radialis longus (ECRL) and brevis (ECRB).abductor pollicis longus (APL) and extensor pollicis brevis (EPB).The Wrist Extensor Compartments, from lateral to medial, contain the tendons of: It is consistently found on the base of the fourth compartment. The Posterior Interosseous Nerve is the only nerve found in the dorsal wrist compartments. The Extensor compartments of the wrist contain the extensor tendons of the hand.
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