• 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.
Srinivasan R, Rhodes J. The Median-Ulnar Anastomosis (Martin-Gruber) in Normal and Congenitally Abnormal Fetuses. Arch Neurol. 1981;38(7):418–419. doi:https://doi.org/10.1001/archneur.1981.00510070052007
Customize your JAMA Network experience by selecting one or more topics from the list below.
Create a personal account or sign in to: