. Cunningham's Text-book de l'anatomie. L'anatomie. L'ulna. 211 Processus de CORONOID semilunaris Olécrâne Incisura creux Interosseous ICtPITAL tubérosité crest longus les muscles, du haut en bas. La face interne du processus de coronoid fusionne avec l'olécrâne dorsalement, et avec la face interne de l'arbre dans la partie distale. L'incisura semilunaris (O.T. une plus grande cavité sigmoïde), pour l'articulation avec la trochlée de l'humérus, est une encoche semi-circulaire, la partie proximale de qui est formé par la surface palmaire de l'olécrâne, tandis que distalement c'est achevé par la surface proximale de th

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. Cunningham's Text-book of anatomy. Anatomy. THE ULNA. 211 Olecranon Incisura semilunaris CORONOID PROCESS Tuberosity ICtPITAL HOLLOW Interosseous crest longus muscles, from above downwards. The smooth medial surface of the coronoid process merges with the olecranon dorsally, and with the medial surface of the shaft distally. The incisura semilunaris (O.T. greater sigmoid cavity), for articulation with the trochlea of the humerus, is a semicircular notch, the proximal part of which is formed by the volar surface of the olecranon, whilst distally it is com- pleted by the proximal surface of the coronoid process. Constricted towards its deepest part by the notching of its lateral borders, the articular surface is occasionally crossed by a narrow im- pression which serves to define the ole- cranon proximally from the coronoid distally. The articular area is divided into a medial portion, slightly con- cave transversely, and a lateral part, transversely convex to a slight degree, by a longitudinal smooth ridge which extends from the most prominent part of the border of the olecranon proxim- ally to the most outstanding point of the coronoid process distally. The margins of the semilunar notch are sharp and well defined, and serve, with the exception of the area occupied by the radial notch, for the attachment of the capsule of the elbow-joint. The radial notch (O.T. lesser sigmoid cavity), placed on the radial side of the coronoid process, is an oblong articular surface for the reception of the head of the radius. It encroaches on the distal and lateral part of the semilunar notch, so as to narrow it considerably. Separated from it by a rectangular curved edge, it displays a surface which is plane from above downwards, and concave from before backwards. Its volar extremity is narrower and more pointed than its dorsal, and becomes confluent with the anterior edge of the coronoid pro- cess, at which point the annular liga- ment, which retains the head of the radius in po

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