How are the dorsal interossei numbered?,”Numbered radial to ulna on 2, 3, 3 June 19, 2017 mfadmin Biology Average Rating 0 out of 5 stars. 0 votes.You must log in to submit a review. How are the dorsal interossei numbered?,”Numbered radial to ulna on 2, 3, 3 and 4.”