NERVE OVERLAP — PAIN SENSE — PERIPHERAL NERVES 371 



In a case wherein a partial ulnar lesion was combined with a 

 complete section of the median nerve prick pain was preserved 

 in the radial portion of the pahn and index finger. When at 

 operation the superficial radial nerve was resected for use as a 

 cable transplant, this part of the palm became analgesic (fig. 8, 

 A, A'). This proves that what sensation was present in the 

 radial portion of the palm and index finger was subserved by the 

 radial nerve. 



Fig. 7 Illustrating, A, the usual area in which pain sensibility returns be- 

 fore tactile sensibility when the external popliteal nerve is severed alone; B, the 

 ulnar alone; C, the radial alone. In Figure D, the shaded area represents 

 that return of pain sensibility in isolated section of the median nerve, due to 

 ulnar overlap; the black area that due to radial overlap. 



In cases of complete section of the ulnar nerve where the 

 superficial radial nerve was severed to be used as a cable trans- 

 plant, the preexisting sensibility to pain on the radial border of 

 the sensory supply of the ulnar nerve disappeared, proving that 

 this sensibility was subserved by the radial nerve (fig. 8, B, C, 

 D, B', C, DO. 



