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/ōˈlekrəˌnän/  /ˌōləˈkrā-/ Noun, pl. olecranons 1. A large, thick, curved bony eminence of the forearm that projects behind the elbow. It is situated at the upper (proximal) end of the ulna, one of the two bones in the forearm. When the hand faces forward (supination) the olecranon faces towards the back (posteriorly). It is bent forward at the summit so as to present a prominent lip which is received into the olecranon fossa of the humerus in extension of the forearm. ( 2. The bony process at the top of the ulna forming the point of the elbow. ( 3. The large process of the ulna that projects behind the elbow, forms the bony prominence of the elbow, and receives the insertion of the triceps muscle. ( 4. Process of the ulna that forms the outer bump of the elbow and fits into the fossa of the humerus when the arm is extended. ( 5. The large process at the proximal end of the ulna which projects behind the articulation with the humerus and forms the bony prominence of the elbow. ( Syn: olecranon...

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