THE LUMBAR NERVES 



divides between that muscle and the Obliquus internus abdominis into a lateral 

 and an anterior cutaneous branch. 



The lateral cutaneous branch (ramus cutaneus lateralis; iliac branch) pierces the 

 Obliqui internus and externus immediately above the iliac crest, and is distributed 

 to the skin of the gluteal region, behind the lateral cutaneous branch of the last 

 thoracic nerve (Fig. 830) ; the size of this branch bears an inverse proportion to that 

 of the lateral cutaneous branch of the last thoracic nerve. 



LUMBAR PORTION 

 ,'OF SYMPATHETIC 



FIRST LUMBAR 



TWELFTH THORACIC 



NERVE TO QUAORA- 

 TUS LUMBORUM 



TKANSVERSAL1S 



OBLIQUUS INTERNUS 



OBLIQUUS EXTERNUS 



SECOND LUMBAR 



ILIOHYPOGASTRIC 



THIRD LUMBAR 

 ILIAC BRANCH OF 

 ILIOHYPOGASTRIC 



ABDOMINAL BRANCh 



OF ILIOHYPO 



FOURTH LUMBA 



fIFTH LUMBAR 

 ILIOINGUINAL 



LATERAL FEMORAL 

 CUTANEO! 



OBTURATOR NEB 



EXTERNAL SPERMA 

 bRANCH OF GEN 

 FEMO! 

 LUM8O.NGUINAL BRAN 



POSTERIOR BRANCH 



CUTANEOUS 



ANTERIOR BRANCH OF 



LATERAL FEMORAL 



CUTANEOUS 



ILIOHYPOGASTRIC 



ILIOINGUINAL 



GENITOFEMORAL 

 RAMUS COMMU- 

 NICANS 



LAT. FEMORAL 

 CUTANEOUS 



GENITOFEMORAL 



TERNAL SPERMATIC 

 BRANCH 



M80IN3UINAL BRANCH 



APONEUROSIS OF EX- 

 TERNAL OBLIQUE 



DORSAL NERVE 

 OF PENIS 



FIG. 824. Deep and superficial dissection of the lumbar plexus. (Testut.; 



The anterior cutaneous branch (ramus cutaneus anterior; hypogastric branch) 

 (Fig. 825) continues onward between the Obliquus internus and Transversus. It 

 then pierces the Obliquus internus, becomes cutaneous by perforating the aponeu- 

 rosis of the Obliquus externus about 2.5 cm. above the subcutaneous inguinal ring, 

 and is distributed to the skin of the hypogastric region. 



The iliohypogastric nerve communicates with the last thoracic and ilioinguinal 

 nerves. 



