. Anatomie, descriptif et appliquée. L'anatomie. L'ULNA, OB COUDE 187 processus Olécrâne la flexion de l'avant-bras. Sa surface supérieure est lisse, concave, et forme la partie inférieure de la grande cavité sigmoïde. En vertu de la siirface est concave, et marqué par une impression en interne pour l'insertion de la brachiale anticus. Au junc- tion de cette surface avec l'arbre est un cardinal, le bacille de l'ulna (tuberositas ulnae), pour la fixation de la barre oblique ligament de l'articulation radio-ulnaire moyen. Sa surface extérieure' présente un étroit, de forme oblongue, la dépression, les ERP articulaire

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. Anatomy, descriptive and applied. Anatomy. THE ULNA, OB ELBOW BONE 187 Olecranon process flexion of the forearm. Its upper surface is smooth, concave, and forms the lower part of the greater sigmoid cavity. The under siirface is concave; and marked by an impression internally for the insertion of the Brachialis anticus. At the junc- tion of this surface with the shaft is a rough eminence, the tubercle of the ulna (tuberositas ulnae), for the attachment of the oblique ligament of the middle radio-ulnar articulation. Its outer surface presents' a narrow, oblong, articular depression, the lesser sigmoid cavity. The inner surface, by its prominent free margin, serves for the attachment of part of the internal lateral ligament. At the front part of this surface is a small, rounded eminence for the attach- ment of one head of the Flexor sublimis digitorum; behind the eminence, a depression for part of the origin of the Flexor profundus digitorum; and, descend- ing from the eminence, a ridge which gives attachment to one head of the Pro- nator teres. Generally, the Flexor longus pollicis has an origin from the lower part of the coronoid process by a rounded bundle of muscle fibres. The greater sigmoid cavity (incisura semilunaris) is a semilunar depression of large size, formed by the olecranon and coronoid processes, and serving for articulation with the trochlear surface of the humerus. About the middle of either lateral border of this cavity is a notch which con- tracts it somewhat, and serves to indicate the junction of the two processes of which it is formed. The cavity is concave from above downward, and divided into two lateral parts by a smooth, elevated ridge which runs from the summit of the olecranon to the tip of the coronoid process. Of these two portions, the internal is the larger, and is slightly concave transversely; the external portion is convex above, slightly concave be- low. The articular surface, in the recent state, is covered with a thin layer

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