Os ulna
In the past called ulna (term always employed in the current language), the ulna is one of both Os of the Avant-bras with the Radius.
It is a long bone occupying the lower part of the front armlever and playing a fundamental role in the movements of Rotation of the front armlever and the Main. It is composed of a central body and two ends, with a very bulky higher end and belonging to the articulation Coude, and a lower end belonging to the articulation of the Poignet.
Diagram
These two bones are connected by radio-ulnar articulation S allowing the movements of inflection and Pronation. The ulna is the bone of the front armlever with the building Proximal the bulkiest. One finds there the incisure trochléaire which presents a relief, it is the process coronoïde. One notices also radial incisure where comes to fit the radius. On this bone one can see several insertion points of the muscles of the arm. The ends of the ulna are in proximality the ulnar head and distality the ulnar process styloïde which is an insertion point of the Ligament S.
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