Definitions for olecranonoʊˈlɛk rəˌnɒn, ˌoʊ lɪˈkreɪ nɒn
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olecranon, olecranon process(noun)
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
The bony process at the top of the ulna forming the point of the elbow.
Origin: Greek origin: Olene meaning 'elbow' and 'kranion' is head.
The olecranon is a large, thick, curved bony eminence of the forearm that projects behind the elbow. It is situated at the upper end of the ulna, one of the two bones in the forearm. When the hand faces forward the olecranon faces towards the back. 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. Its base is contracted where it joins the body and the narrowest part of the upper end of the ulna. Its posterior surface, directed backward, is triangular, smooth, subcutaneous, and covered by a bursa. Its superior surface is of quadrilateral form, marked behind by a rough impression for the insertion of the Triceps brachii; and in front, near the margin, by a slight transverse groove for the attachment of part of the posterior ligament of the elbow-joint. Its anterior surface is smooth, concave, and forms the upper part of the semilunar notch. Its borders present continuations of the groove on the margin of the superior surface; they serve for the attachment of ligaments, viz., the back part of the ulnar collateral ligament medially, and the posterior ligament laterally.
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