c6aa2781_Bony_Landmark__0
[1] Attachment for triceps brachii tendon [2] Patient with arm at side, elbow flexed approximately 30 degrees [3] Bony prominence of the proximal ulna, just distal to the olecranon fossa and lateral to the medial epicondyle of the humerus [0] 
Olecranon process
Bony Landmark