280 The Nerves and Muscles-of the Leg 
The extensive anterior type of distribution is also more frequently 
associated with an anterior origin of the lateral cutaneous nerve than 
with a posterior origin. This is indicated in the following table. 
TABLE V. 
Distribution of Lateral Cutaneous Nerve. 
Spinal Nerves from which Lateral Lateral. Lateral and Lateral and 
Cutaneous Nerve arose. ee : eee 
No. of No. of No. of 
inst. inst. inst. 
((.<9;6) iad @.l FD, OG fl enaeartctraie. Geman acre cus cies 10 8 2 
XOX) REND «a. 5 isin dosstettnsne eke sgevoronave Se 18 10 1 
>, ©.4l AiG SRA ain B.tiets ctor 9 3 
(ROK) WOME DONE Sloe 65 og c0.c.oac 25 13 5 
EXO TTL “eXEX TAT eee epee cher cuctore 5 3 al 
XX EXERC  tepaeyeravateveters atte te 10 3 
Trunk of femoral Nerves...) ses. 15 3 
The relations existing between the various types of distribution of 
the lateral cutaneous nerve and the various types of distribution of the 
lumbo-inguinal nerve are shown in the following table. 
TABLE VI. 
Types of Distribution of the Lumbo-inguinal Nerve. 
Types of Distribution of = 
Lateral Cutaneous Latera). Anterior. Medial. Lat. 
Nerve. oO, nil 
SUt. Mod. Ext. SI’t. Mod. Ext. SI’t. Mod. Ext. Med. 
Watherale ewe ne ckae %,- 2 5 1 4 21 4 3 4 0 9 1 
Lateral and anterior 1 2 2 4 3 iL 7 i 4 2 
Lateral and medial. 1 i 3 il 1 il 1 
Wantine  .... . 2 1 
The most striking feature brought out by this table is the frequent 
association of an extensive anterior distribution of the lateral cutaneous 
nerve with a moderate or extensive medial distribution of the lumbo- 
inguinal nerve. This is shown in the Léveillé plate referred to above. 
This extensive distribution on the thigh of nerves derived directly from 
the 21st and 22d spinal nerves is, as has been pointed out above, most 
frequently associated with an anterior type of lumbo-sacral plexus and 
this in turn probably with a somewhat anterior position of the limb-bud 
at the time of the ingrowth of nerves. When the 21st and 22d spinal 
nerves are called upon to furnish a greater supply than usual of nerve 
fibres to the limb they are more apt to do so through direct paths (the 
Jateral cutaneous and lumbo-inguinal nerve trunks) than through the 
more indirect route of the femoral nerve and its branches. This feature 
oe. 
