TABLE V. 

 The Various Types op Distribution of the Border-nerves. 

 (Total number of instances studied, 287. See Figures on opposite page. 

 I. T?ie border-nerves arise from the 20th and 21st spinal nerves. 50 instances, 17^ of 

 tbe total number. 



A. Hypogastric and inguinal nerves arise from the 20th spinal nerve, the 

 genito-crural from the 21st, after this has received a communicating branch 

 from the 20th. 5 instances, 10^. See Fig. I A. 



B. Like A, but with no communicating branch, 6 instances, 12^. 



C. The hypogastric nerve arises from the 20th spinal, the inguinal and genito- 

 crural nerves arise from the 21st, after this has received a communicating 

 branch from the 20th. 21 instances, 42^. See Fig. I C. 



D. Like C. but with no communicating branch. 11 instances, 22^. 



E. The hypogastric nerve, arises from the 21st spinal, after this has received a 

 communicating branch from the 20th. The inguinal and genito-crural nerves 

 likewise arise from the 21st. 7 instances, 14^. 



II. All border-nerves arise from t?ie 21st spinal nerve. 6 instances, 2^ of total mimber. 

 See Fig. II. 



III. The border-nerves arise f7'om the 20th, 21st, and 22nd spinal nerves. 139 instances, 



4:9/^ of total number. 



A. The hypogastric nerve arises from the 20th spinal, the inguinal from the 

 21st and from a proximal communicating branch from the 20th, the genito- 

 crural from the 21st and 22nd. 27 instances, 19^. See Fig. Ill A. 



B. Like A, but with no proximal communicating branch. 27 instances, 19^. 



C. The hypogastric and inguinal nerves arise from the 21st spinal nerve and 

 from a proximal communicating branch from the 20th, the genito-crural 

 arises from the 21st and 23nd spinal nerves. 68 instances, 49<^. See Fig. 



inc. 



D. Like C, except that none of the fibres from the 20th spinal nerve go into 

 the inguinal nerve. 8 instances, 6^. 



E. Two hypogastric branches, one from the 20th and one from the 21st spinal 

 nerves, inguinal from 21st, genito-crural from 21st and 22nd. 9 instances, 

 7^. See Fig. Ill E. 



IV. The border-nerves arise from the 21st and 22nd spinal nerves. 86 instances, 30^ of 



total number. 



A. Hypogastric and inguinal nerves from the 21st, genito-crural from the 31st 

 and 22nd. 78 instances, 91^. 'P^ ^< 



B. Hypogastric and inguinal nerves from the 21st, genito-crural from the33nd. 

 8 instances, 9<^. 



V. The border-nerves arise from the 21st, 22nd and 23rtZ spinal nerves. 



Hypogastric from the 20th and 21st spinal nerves, inguinal from the 21st 

 and 22nd, genito-crural from the 22nd-23rd. 6 instances, 3^ of total 

 number. 



DESCRIPTION OF THE FIGURES ON OPPOSITE PAGE. 



These figures represent the distal abdominal and the border-nerves of various types 

 in their relation to the abdominal wall, spinal column, skeleton of the limb and 

 lumbo-sacral plexus. The ventral portion of the abdominal wall is shown turned 

 back. The transversalis muscle is not represented. In the rectus muscle the trans- 

 verse tendon corresponding to the tenth rib is shown in all figures except Fig. V. 

 A transverse tendon corresponding to the eleventh rib is shown in Figures IV A and 

 V. In each figure the hypogastric nerve is represented passing through the internal 

 oblique muscle near its distal margin and at a point about half the distance between 

 the anterior superior spine of the ilium and the distal extremity of the rectus. The 

 inguinal nerve is shown coursing from the anterior superior spine of the ilium to the 

 crest of the pubis. The genital and crural nerves pass from the pelvis in various 

 regions, the genital branches in each instance becoming united to the inguinal nerve 

 while tbe crural branches pass out to the region of the leg. The nerves of the limb 

 arising from the lumbo-sacral plexus are represented diagrammatically in double out- 

 line. The lateral cutaneous nerve passes to a point near the anterior superior spine 

 of the ilium, the femoral nerve passes to a point over the head of the femur, the 

 obturator emerges through the obturator foramen, the sciatic nerve passes behind the 

 ischium and the pudic nerve passes between the great and lesser ischio-sacral liga- 

 ments. 



The twelfth rib is denoted by the appropriate numeral, except in Fig. I C, where 

 the eleventh is thus designated. 



(218) 



