Charles R. Bardeen 281 
is further brought out in the not infrequent association with the an- 
terior forms of plexus of a direct anterior cutaneous branch from the 
plexus to the front of the thigh. 
2. Separate Anterior Cutaneous Nerves. 
Nerves of this sort spring usually from the XXI and XXII spinal 
nerves, but also sometimes from the XXIII and very rarely from the 
XXIV as well. Henle considers them as varieties of the lumbo-inguinal. 
In their course, however, they usually, at least, lie beneath or deep in 
TABLE VII. 
Type of Plexus from which the | Wagers bs 7 ee emma 
N. Cut. Fem. Lat. arises: £ 
From From 
M Distal Spinal (GXEXT) EXCX XE XOX 
Type. Furcal Nerve. pane ae chi ae Spinal Nerves. | Spinal Nerves. 
erve to Limb. | No. of instances. | No. of instances. 
B XXIV le eXeXO VAT 1 | 
C XXIV chiefly to XXVIII 10 1 
sacral plexus | 
D XXIV chiefly to XXVIII p 
lumbar plexus 
Ye 11lt 51 68s 2¢ 1 
12th rib rudimentary 8 1 
Type of 
vertebral axis 
Not recorded 2 1 
| 
Normal i 
the psoas muscle and beneath the iliac fascia instead of lying above 
the latter like the lumbo-inguinal nerve. A direct anterior (high middle) 
cutaneous nerve of the thigh was found 14 times in 123 instances 
(11.4%). It arose 11 times from the XXI and XXII spinal nerves 
and 3 times from the XXII and XXIII (once from a region opposite 
the XXIV spinal nerve). In the last instance entrance of fibres from 
the XXIV nerve was possible but was not certain. In all instances ex- 
cept two it arose in association with an anterior form of plexus. In all 
instances recorded except one the spinal axis showed a tendency to re- 
duction by the presence of a rudimentary 12th rib and in one instance 
there were but eleven thoracic vertebre. These facts are illustrated in 
the above table. 
