Extensor compartments of the wrist
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The forearm extensor tendonspass under the extensor retinaculum at the level of the wrist. The ligament is divided into six extensor compartments, separated by fibrous septa passing to the bones of the forearm 2.
The compartments in order from radial to ulnar are:
3rd compartment (separated from compartment 2 by Lister's tubercle):
6th compartment (runs in the groove of the ulnar head):