
Extensor Indicis Muscle
Primary Actions of the Extensor Indicis
1. Extension of the second digit at the metacarpophalangeal joint
Agonists:
- Extensor digitorum
Antagonists:
- First dorsal interossei
- First Palmar Interosseous
- First Lumbricals (hand)
- Flexor Digitorum Superficialis
- Flexor Digitorum Profundus
2. Extension of the second digit at the proximal interphalangeal joint
Agonists:
- Extensor Digitorum
- First Lumbrical
- First Dorsal Interosseous
- First Palmar Interosseous
Antagonists:
- Flexor Digitorum Profundus
- Flexor Digitorum Superficialis
3. Extension of the second digit at the distal interphalangeal joint
Agonists:
- Extensor Digitorum
- First Dorsal Interossei
- First Palmar Interossei
- First Lumbricals
Antagonists:
- Flexor Digitorum Profundus
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Secondary Actions of the Extensor Indicis:
1. Assists with adduction of the second digit at the carpometacarpal joint
Agonists:
- First Palmar Interosseous
Antagonists:
- First Dorsal Interosseous
Information about cause and effect of Extensor Indicis pain: Extensor Indicis Muscle: Hand and Finger Pain