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| | II. Osteology. 6a. 4. The Ulna. Gray, Henry. 1918. Anatomy of the Human Body. (Site not responding. Last check: 2007-11-02) |
 | | The upper extremity presents two curved processes, the olecranon and the coronoid process; and two concave, articular cavities, the semilunar and radial notches. |
 | | The olecranon is a large, thick, curved eminence, situated at the upper and back part of the ulna. |
 | | The semilunar notch is a large depression, formed by the olecranon and the coronoid process, and serving for articulation with the trochlea of the humerus. |
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