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Extensor Indicis
The extensor indicis proprius also known as the Extensor indicis is a narrow, elongated muscle, placed medial to, and parallel with, the extensor pollicis longus.
Anatomy of the Extensor indicis Muscle
The extensor indicis is supplied by the posterior interosseous artery as arises from the dorsal surface of the body of the ulna below the origin of the Extensor pollicis longus and from the interosseous membrane.
Its tendon passes under the dorsal carpal ligament in the same compartment as that which transmits the tendons of the Extensor digitorum communis, and opposite the head of the second metacarpal bone, joins the ulnar side of the tendon of the Extensor digitorum communis which belongs to the index finger.
Functions of the Extensor indicis Muscle
The main function of the extensor indicis muscle is to extend the index finger and also help in extending the wrist.
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