. Martin-Gruber Anastomosis. OrthopaedicsOne Articles. In: OrthopaedicsOne - The Orthopaedic Knowledge Network. Created Apr 24, 2012 14:41. Last modified Apr 24, 2012 14:41 ver.2. Retrieved 2015-08-01, from http://www.orthopaedicsone.com/x/WwD5B.
Originally described by Martin in 1763 and later by Gruber in 1870, this is an anomalous innervation pattern occurring between the median and ulnar nerves in the forearm. Specifically, fibers from the median nerve cross over to the ulnar nerve in the forearm. Martin-Gruber anastomosis is the most common anomalous innervation of the hand, with an incidence of 15% to 28%.