Bilateral anatomical variations in the extensor compartment of forearm and hand

Extensor digitorum muscle tendon to the index finger from the extensor carpi radialis brevis: a cadaveric case report

“…Musculotendinous variant connections to the index finger are frequently described in the literature. Vaida et al [23] reported an EI, originating from the ECRB and replacing the tendon of the ED-index. The other muscle was the extensor indicis and medii communis split to three tendons, two of which attached to the index finger and one to the middle digit.…”