A manual of operative surgery . d horizontallyjust below the tip of the styloidprocess of the radius would hitthe scaphoid bone. A line drawn between the twostyloid processes slopes down-wards and outwards ; its twoextremities represent the extremeinferior limits of the radio-carpaljoint, and it fairly corresponds tothe chord of the arc formed bythe line of that joint. The linebetween the styloid processes is slightly less than half an inch below the summit of the arch of thewrist-joint. The radial artery winds round to the back of the wrist, just belowthe styloid process of the radius, lying
A manual of operative surgery . d horizontallyjust below the tip of the styloidprocess of the radius would hitthe scaphoid bone. A line drawn between the twostyloid processes slopes down-wards and outwards ; its twoextremities represent the extremeinferior limits of the radio-carpaljoint, and it fairly corresponds tothe chord of the arc formed bythe line of that joint. The linebetween the styloid processes is slightly less than half an inch below the summit of the arch of thewrist-joint. The radial artery winds round to the back of the wrist, just belowthe styloid process of the radius, lying upon the external lateral liga-ment of the joint, and beneath the extensors of the metacarpal boneand first phalanx of the thumb. It then runs over the scaphoid andtrapezium, and, as it is about to dip between the two heads of theabductor indicis, is close to the carpo-metacarpal joint of thethumb. The position of such branches of the radial and ulnar arteries asare distributed in the neighbourhood of the wrist must be borne in. FrG. 456. -SYNOVIAL CAVITIES OF THEWRIST. 732 OPERATIONS ON BONES AND JOINTS [part vii mind. The vessels most apt to bz wounded in excision of the wristare the radial, the deep palmar arch, the anterior and posterior carpalarches, and the dorsal interosseous branch of the radial. The Operation.—The main incision, which may be the only one,should be a longitudinal one placed just to the outer side of the commonextensor tendons of the fingers, and over the metacarpal bone of theindex. Whether it runs in a straight line (Boeckel and Langenbeck)or is slightly angular (Lord Lister) is not a matter of much second incision, placed on the ulnar aspect of the wrist, between
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