. Atlas and epitome of traumatic . FRACTURES OF THE UPPER EXTEE3IITY. 143 that the prominence belongs to the humerus, and by itsspherical form it is recognized as the head of that bone. The arm is in abduction, and immediately returnsto that position when the reducing force is removed; i. <?.,by the exertion of a moderate force it can be adducteduntil it comes in contact with 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-humeralligament
. Atlas and epitome of traumatic . FRACTURES OF THE UPPER EXTEE3IITY. 143 that the prominence belongs to the humerus, and by itsspherical form it is recognized as the head of that bone. The arm is in abduction, and immediately returnsto that position when the reducing force is removed; i. <?.,by the exertion of a moderate force it can be adducteduntil it comes in contact with 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.
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Keywords: ., bookcentury1900, bookdecade1900, bookidatlasepitome, bookyear1902
