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S. R. DETWILER 



location was somewhat dorsal and approximately the distance 

 of two and one-half segments anterior to the normal site. Ex- 

 amination of sections revealed a well-developed shoulder-girdle. 

 The shoulder muscles were normally present, but within complete 

 nerve supply (table 3) , which placed considerable restrictions on 

 the shoulder movements. The muscles of the limb were typically 

 developed. Only one nerve trunk entered the limb, however, 

 and this was situated on the flexor surface. The extensor paraly- 

 sis which this limb showed and the absence of an extensor nerve 

 trunk have been observed in a considerable number of trans- 



Fig. 20 Graphic reconstruction of segmental nerves supplying transplanted 

 right anterior limb in case AA2S78 (fig. 19). X 25. Arrow indicates position of 

 limb and level of section shown in figure 32. 



planted limbs. The reasons for this specific deficiency in the 

 presence of muscular differentiation are not yet clear. 



The nerve supply to the shoulder and limb was derived from 

 the ventral rami of the first, second, and third spinal nerves. 

 The pathway of these nerves in their contribution to the limb 

 plexus is seen in figure 20. The entire ventral rami of the first 

 and second spinal nerve were contributed to the brachial plexus. 

 The ventrolateral musculature, which was sparse in this case, 

 lacked innervation. A small m. sternohj^oideus was present, 

 but the m. geniohyoideus and the m. hyogiossus were entirely 

 lacking. Figure 32^ shows the internal configuration of a trans- 

 verse section at the level A — A, figure 19. The ventral ramus 



