Conversely, extension of the ring finger exerts an extensor force upon its neighbors, such that they can be actively extended even if the middle and little finger extensor tendons are severed proximal to the juncturae.Īt the point where the tendons cross the wrist, there is a ligamentous structure called a retinaculum that appears to lay over the tendons and their sheaths. 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. Late rupture after closed treatment of distal radius fractureĭorsal Extensor compartments of the wrist See Also: De Quervain's tenosynovitis Wrist Extensor Anatomy See Also: Wrist Anatomy Extensor compartments of the wrist Compartment The mnemonic 2 2 1 2 1 1 can be used to remember the number of tendons in each compartment. As these tendons pass through the compartments, they are invested with synovial sheaths.
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