At the junction of the antero-inferior surface of the coronoid process with the front of the body is a rough eminence, the tuberosity of the ulna (or ulnar tuberosity), which gives insertion to a part of the Brachialis; to the lateral border of this tuberosity the oblique cord is attached.Tuberosity of the ulna.Tuberosity of the ulna.Tuberosity of the ulna. At the junction of the antero-inferior surface of the coronoid process with the front of the body is a rough eminence, the tuberosity of the ulna (or ulnar tuberosity), which gives insertion to a part of the Brachialis; to the lateral border of this tuberosity the oblique cord is attached. This article incorporates text in the public domain from page 214 of the 20th edition of Gray's Anatomy (1918)