Anatomy - Extensor indicis muscle

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Extensor indicis - Insertion

Base of the middle and distal phalanxes of second phalange (dorsal surface)

Extensor indicis - Action

Extension of the index finger at the metacarpophalangeal joint, weak wrist extension, weak supination of the forearm from a pronated position

Extensor indicis - Origin

Middle to distal one-third of the posterior ulna

Extensor indices - Innervation

Radial nerve (C6-C8)


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