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July 1981

The Median-Ulnar Anastomosis (Martin-Gruber) in Normal and Congenitally Abnormal Fetuses

Author Affiliations

From the Department of Anatomy, Mount Sinai School of Medicine, New York.

Arch Neurol. 1981;38(7):418-419. doi:10.1001/archneur.1981.00510070052007

• The median-ulnar anastomosis (Martin-Gruber) of the forearm was present in 15% of the normal fetuses dissected. Among the congenitally abnormal fetuses, all the cases of trisomy 21 had the anastomosis in both forearms. The anastomosis is usually between the anterior interosseous nerve and the ulnar nerve and could be classified into six basic patterns.