extensor indicis muscle

(redirected from Extensor indicis proprius)
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ex·ten·sor in·di·cis mus·cle

(eks-ten'sŏr in'di-sis mŭs'ĕl)
Origin, dorsal surface of ulna; insertion, dorsal extensor aponeurosis of index finger; action, assists in extending the forefinger; nerve supply, radial.
Synonym(s): musculus extensor indicis [TA] , index extensor muscle.
References in periodicals archive ?
In needle electromyography (EMG) APB, ADM, extensor indicis proprius (EIP) (all by C8, T1 roots and by different peripheral nerve innervated muscles) and some proximal muscles (biceps, triceps) were investigated.
This is a specific sign that paralysis is present in the middle and ring fingers, but not in the index finger, because of the presence of another extensor indicis proprius. This hypothesis is supported by seven cases of isolated paralysis of extensor digitorum in the Thompson approach (Spinner et al., 1998).

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