The extensor indicis propius (EIP) muscle is one of the muscles of the posterior deep compartment of the forearm. It is involved in the extension of the second digit at the metacarpophalangeal and interphalangeal joints 1.
Summary
origin: posterior surface of ulna and interosseous membrane
insertion: extensor expansion of second digit
action: extends the second digit and helps in hand extension
arterial supply: posterior interosseous artery
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innervation: posterior interosseous nerve (C7, C8)
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