Martin-Gruber Anastomosis

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search

The Martin-Gruber anastomosis (MGA or Martin-Gruber connection) is a communicating nerve branch between the median nerve and the ulnar nerve in the forearm. It is the most common anastomotic anomaly that occurs between these two nerves.[1] This connection carries motor nerve fibers. In cases of nerve lesions of the median or ulnar nerves, the MGA can serve as a conduit for alternative innervation of portions of the forearm or hand. This inconstant pattern of connection can serve as explanation for a difficult or challenging differential diagnosis.[2] In one study,[3] the MGA was found in 22.9% of cadaver specimens, while another found the incidence at ~11% [4]. This relatively high incidence demonstrates the necessity for healthcare specialists to factor the MGA into their diagnoses.


  1. ^ Erdem HR, Ergun S, Erturk C, Ozel S (June 2002). "Electrophysiological Evaluation of the Incidence of Martin-Gruber Anastomosis in Healthy Subjects". Yonsei Medical Journal. 43 (3): 291–5. doi:10.3349/ymj.2002.43.3.291. PMID 12089734.
  2. ^ Unver Dogan, Nadire (March 14, 2009). "The communications between the ulnar and median nerves in upper limb" (PDF). Retrieved 2012-09-01.
  3. ^ Rodriguez-Niedenführ M, Vazquez T, Parkin I, Logan B, Sañudo JR (March 2002). "Martin-Gruber anastomosis revisited". Clinical Anatomy. 15 (2): 129–34. doi:10.1002/ca.1107. PMID 11877791.
  4. ^ Kaur, et al. (Feb 2016). "Martin–Gruber Anastomosis- A Cadaveric Study in North Indian Population". Journal of Clinical and Diagnostic Research. 10 (2): AC09–AC11. doi:10.7860/JCDR/2016/16447.7247. PMC 4800503. PMID 27042438.