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👋🏼The dorsal wrist contains 6 extensor compartments. There are 12 extensor muscles, all of which are innervated by the radial nerve directly or its terminal motor branch, the posterior interosseous nerve (PIN). The radial nerve innervates brachioradialis, anconeus, and ECRL. ECRB may be innervated by the radial nerve or PIN. All other extensor muscles are innervated by PIN. The muscles are arranged into two layers: (1) superficially, the anconeus, ECRL, ECRB, EDC, EDM, and ECU, and (2) deep, APL, EPB, EPL, EIP. ⁠

❗The first dorsal compartment contains APL and EPB. APL inserts at the base of the first metacarpal. EPB inserts at the base of the proximal phalanx. The second dorsal compartment contains ECRL and ECRB. ECRL attaches to the base of the 2nd metacarpal. ECRB attaches at the base of the 3rd metacarpal. The third dorsal compartment contains EPL which winds around Lister’s tubercle, it attaches at the base of the distal phalanx of the thumb. The fourth dorsal compartment contains EDC and EIP. The EDC contains no bony attachment but develops into the extensor mechanism (see our other post for more information). The EIP runs ulnarly to EDC. The EDM runs in the fifth compartment and runs ulnarly to EDC as well. The ECU runs into the sixth compartment and attaches at the base of the 5th metacarpal. ⁠
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