220 



ohypogastric N 



femoral N 



> gluteal N 



tibial N 



peroneal N 

 gluteal M 



eopsoas M 



Fig. 2. Plexus of type A. 



Figures 2 — 8. 



These figures rejiresent the seven types of jilexuses tabulated in tables 2 — 8. Each 

 figure represents a plexus actually observed. 



The vertebral coliuun aud the pelvis are repi'eseuted divided in the median line 

 and the plexus is viewed from in front and at the right. 



The lower intei'costal muscles, the subcostal, a part of the transverse, the quadratus 

 lumborum, the iliac and pyi-iform muscles ; and the sacro-iliac and greater and lesser 

 sciatic ligaments are represented. 



The most anterior and the most posterior nerves to supply the time nerves of the 

 limb are indicated at the right in Roman numerals. The nerves arising from the 

 lateral [dorsal] divisions of the lumbar and sacral plexuses are represented black; these 

 arising from the median [ventral] divisions are represented lighter in color. 



The relations of the anterior border nerves to the anterior nerves of the limb are 

 shown in detail. For the sake of clearness the posterior border nerves are represented 

 simplified. The lateral [doi-sal] members of this group are represented by the inferior 

 pudendal nerve, the median [ventral] members by the pudic nerve. 



The variations in the skeletal conditions arc represented as well as the variations 

 in the relative positions of the nerves. 



