JROLOGY 



nerve. The accessory obturator, when it exists, is formed by the union of two small 

 branches given off from the third and fourth nerves. 





FIG. 823. The lumbar plexus and its branches. 



The branches of the lumbar plexus may therefore be arranged as follows: 



Iliohypogastric 

 Ilioinguinal . 

 Genitofemoral 



Lateral femoral cutaneous 

 Femoral . 



Obturator 



Accessory obturator . 



. 1L. 

 . 1 L. 

 1, 2 L. 



Dorsal divisions. 

 . 2, 3 L. 

 . 2, 3, 4 L. 



Ventral divisions. 

 . 2, 3, 4 L. 

 . 3, 4 L. 



The Iliohypogastric Nerve (n. iliohypogastricus) arises from the first lumbar nerve. 

 It emerges from the upper part of the lateral border of the Psoas major, and crosses 

 obliquely in front of the Quadratus lumborum to the iliac crest. It then perforates 

 the posterior part of the Transversus abdominis, near the crest of the ilium, and 



