. Anatomy, descriptive and applied. Anatomy. 498 THE MUSCLES AND FASCIA scapula to rotate on the thoracic wall; this carries the acromion and outer end of the outer fragment of the clavicle forward and causes the piece of bone to rotate around a vertical axis through its centre, and so carries the inner end of the outer portion backward. The depression of the whole outer fragment is produced by the weight of the arm and by the contraction of the Deltoid. The outer end of the inner fragment appears to be elevated, the skin being drawn tensely over it; this is owing to the depression of the oute
. Anatomy, descriptive and applied. Anatomy. 498 THE MUSCLES AND FASCIA scapula to rotate on the thoracic wall; this carries the acromion and outer end of the outer fragment of the clavicle forward and causes the piece of bone to rotate around a vertical axis through its centre, and so carries the inner end of the outer portion backward. The depression of the whole outer fragment is produced by the weight of the arm and by the contraction of the Deltoid. The outer end of the inner fragment appears to be elevated, the skin being drawn tensely over it; this is owing to the depression of the outer fragment, as the inner fragment is usually kept fixed by the costoclavicular ligament and by the antagonism between the Sterno- mastoid and Pectoralis major muscles. But it may be raised by an unusually strong Sterno- mastoid, or by the inner end of the outer fragment getting below and behind it. The causes of displacement having been ascertained, it is easy to apply the appropriate treatment. The outer fragment is to be drawn outward, and, together with the scapula, raised upward to a level with the inner fragment, and retained in that position. This deformity is corrected by carrying the shoulder upward, outward, and backward. In fracture of the acromial end of the clavicle, between the conoid and trapezoid ligaments onlv slight displacement occurs, as these ligaments, from their oblique insertion, serve to hold both portions of the bone in apposition. Fracture, also, of the sternal end, internal to the costoclavicular liga- ment, is attended with only slight displacement, this ligament serving to retain the fragments in close ap- position. Fracture of the acromion process usually arises from violence applied to the upper and outer part of the shoulder; it is generally known by the rotundity of the shoulder being lost, from the Deltoid drawing -7 /m\ \M^'t'Vl"*if'S will he found resting on the front and upper part of the head of the humerus. In order to relax the anter
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1913
