. Atlas and epitome of traumatic . ith the thorax, but as soonas the pressure is removed, it immediately returns to anabducted position. Thisposition is due to the ten-sion of certain ligaments—the coraco-humeralligaments and the liga-ments attached to thetuberosities. The long axis of thehumerus is directed to-ward the coracoid processor toward a point belowthe clavicle, instead oftoward the acromion, asunder normal is readily deter-mined by comparing theinjured with the soundside. The outer border of theupper arm appears bentand forms an angle withthe vertex directed in-ward,
. Atlas and epitome of traumatic . ith the thorax, but as soonas the pressure is removed, it immediately returns to anabducted position. Thisposition is due to the ten-sion of certain ligaments—the coraco-humeralligaments and the liga-ments attached to thetuberosities. The long axis of thehumerus is directed to-ward the coracoid processor toward a point belowthe clavicle, instead oftoward the acromion, asunder normal is readily deter-mined by comparing theinjured with the soundside. The outer border of theupper arm appears bentand forms an angle withthe vertex directed in-ward, whereas the sound arm presents an almost rectilinearborder. This abnormality is caused by the arm being inabduction, producing the lower half of the line, and bythe stretching of the fibers of the deltoid between theacromion and the humerus, representing the upper seg-ment (or upper side of the angle) of this broken line. The humerus appears to be lengthened and the distancebetween the acromion and a point on the elbow, such as. Fig. 48.—Showing a young manwith a subcoracoid dislocation ofthe humerus on the right long axis of the humerus isindicated on both sides by solidlines. 144 FRACTURES AND DISLOCATIONS. PLATE Dislocation of the Humerus; Anatomic Prep=aration.—This illustration represents a later stage in the dissectionof the specimen shown in the preceding plate. The deltoid muscle hasbeen separated from the clavicle and reflected outward so that the dis-tended acromial portion of the muscle is seen from within. The pec-toralis major has also been separated at its upper border and hangsdown, supported by its costo-sternal origin and its insertion in thehumerus. The pectoralis minor has been divided at the coracoid pro-cess and lies against the inner surface of the greater pectoral. Thecoracoid process is readily recognized by the two short muscular inser-tions, that of the pectoralis minor on the inner side and that of thecoraco-brachialis,
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