223 



XXII spioal N 



XXIV spioal N 



iliolijpngastric N 



inguiual N 



lateral cut N 



is a somewhat greater supply to these nerves from the more distal 

 spinal nerves. 



In type "D", fig. 5, and table 5, we have the most frequent 

 arrangement of the border nerves. The XX spinal nerve is, in over 

 95 ö/o of the in- 

 stances , the last 

 nerve to supply the 

 rectus abdominis 

 muscle. The iliac 

 and hypogastric and 

 inguinal nerves arise 



most frequently 

 from the XXI spinal 

 nerve, in nearly half 

 the cases after the 

 latter has received 

 a branch of commu- 

 nication from the 

 XX spinal nerve 

 The genital and 

 crural nerves arise 

 from the XXI and 

 XXII spinal nerves 

 in the main. The 

 lateral cutaneous 

 nerve arises in all 

 instances from the 

 XXII spinal nerve 

 and, in about 75 ^/q 

 of the cases, from 

 the XXI or XXIII 

 as well. In 15,3 Vo 

 of the cases it arose 

 from the main trunk of the femoral nerve and many have received 

 fibres from the XXIV spinal nerve. Such fibres were traced in five 

 instances. 



In types E and F (see tables 6 and 7 and fig. 6 and 7) the 

 average origin of the border nerves is from more distal spinal nerves 

 and this is still more marked in type G (see fig. 8 and table 8). 



In general it may be said that when the main nerves of the limb 

 arise from a more proximal set of spinal nerves the anterior border 



XXVIII spi 



pudic N 

 inf pudendal N. ■ 



inal N -V j;!- 



Fig. 5. Plexus of type D. 



