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)