. Modern surgery, general and operative. Fig. 546.—Paralysis of musculospiral nerve Fig. 547.—Distribution of sensory after fracture of the humerus (wrist-drop); but nerves on the backs of the fingers: r, when fingers have been flexed into palm, a, they can Musculospiral or radial nerve; «, ulnar be extended, b, at first interphalangeal Joints by nerve; m, median nerve (Krause).lumbricals and interossei, which are supplied bythe ulnar and median nerves (Erichsen). of the first and second fingers cannot be voluntarily flexed. The correspondingphalanges of the third and fourth fingers can be fle
. Modern surgery, general and operative. Fig. 546.—Paralysis of musculospiral nerve Fig. 547.—Distribution of sensory after fracture of the humerus (wrist-drop); but nerves on the backs of the fingers: r, when fingers have been flexed into palm, a, they can Musculospiral or radial nerve; «, ulnar be extended, b, at first interphalangeal Joints by nerve; m, median nerve (Krause).lumbricals and interossei, which are supplied bythe ulnar and median nerves (Erichsen). of the first and second fingers cannot be voluntarily flexed. The correspondingphalanges of the third and fourth fingers can be flexed, this being accompHshedby the unparalyzed ulnar half of the deep flexor. Flexion of the first pha-langes is still possible, as it is accomplished by means of the interossei. Theextensor action of the interossei muscles upon the middle and distal phalanges,being unopposed, may eventually cause subluxation. The sensory distri-bution of the median nerve is shown in Figs. 545 and 547-549. It is the sen-sory nerve of the radial side
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