A variant of the Cannieu-Riche communication: case report.

A variant of Cannieu-Riche communication was encountered during the dissection studies. The communication was between the digital branch to the index finger and branch to the adductor pollicis muscle. Terminal communications between motor nerves may provide muscles with double motor innervation, and are important for the motor innervation of the hand, in particular the thenar muscles. This variant should be kept in mind during surgical operations, electrophysiological examinations of the hand.