Spinal Nerves. 



isr 



501, The Cutaneous 

 Nerves at the , Ante- 

 rior Surface of the 

 Lower Extremity. 



Of the five lumbar ner- 

 ves, Nervi lumbales, the first 

 leaves the intervertebral fora- 

 men between first and second 

 lumbar vertebrae, the last be- 

 tween fifth lumbar and base of 

 the sacrum. The posterior, 

 smaller branches supply the fol- 

 lowing muscles : Erector spinae, 

 Inter transver sales, Multifidus spi- 

 nae and Inter spinales, and the 

 skin of the lumbar and gluteal 

 regions. The a n t e r i o r, 1 a r g e r 

 branches form the lumbar 

 plexus, Plexus lumbalis, which 

 gives ofFthe following branches: 



1. Ileo - hypogastric, 

 N. ileo - liypogastricus , mixed 

 nerve, arises from the first 

 lumbar nerve, and supplies the 

 MM. transver sus abdominis and 

 olliquusinternus. Between trans - 

 versalis and internal oblique 

 muscles it divides into two 

 branches, the iliac, R. iliacus, 

 to the integument of the glu- 

 teal region, and the hypo- 

 gastric, JR. liypogastricus, to 

 the hypogastric region./ 



2. Ileo -inguinal, N. ileo- 

 inguinalis, sensory, also arises 

 from the first lumbar nerve, per- 

 forates the M. transversus ab- 

 dominis above Poupart's liga- 

 ment, passes into the inguinal 

 canal and terminates in the in- 

 tegument of the scrotum and 

 upper and inner part of the 

 thigh in the male, and in the 

 labium in the female, with the 

 Nervi scrotales et labiales ante- 

 rior es. 



GENITO-CRURAL. 

 LUMBO-IMOUIN.) 



N. ILEO- 

 HYPQBA5TR. 



N. 5PERMAT. EXT. 



If saphena, int. 



