276 



PR A CTICAL ANA TOMY. 



oblique, lies in front ot the spermatic cord in the inguinal canal, escapes by the 

 external abdominal ring, and supplies the scrotum and inner side of the thigh. 



3. Gcnito-cmral, descends on the front surface of the psoas magnus, divides 

 into a genital and a crural branch ; the genital branch enters the internal abdom- 

 inal ring, lies behind the spermatic cord, and is distributed to the cremaster mus- 

 cle. In the female it goes with the round ligament, supplies the same with 

 motion, and is lost in the labia majora. 



4. Tlic crural branch of this nerve descends on the external iliac artery, lies 

 in the femoral sheath, and is distributed to the skin covering the insertion of the 

 psoas according to Hilton's law. 



a. \XGLIATED CORD OF SYMPATHETIC 

 LAST THORACIC SERVE 



FIRST LUMBAR 



ILIO- 



JfYPOIiASTRlC 

 ILIO-INGUINAL 



SECOND 

 LUMBAR 



FOURTH 



LUMHAR 



ILIO-INGUINAL 



EXTERNAL 



CUTANEOUS 



OEX1TO-CRURAL 

 LCXBO-SACRAL 



CORD 



AXTERIOR CRURAL 

 OBTURATOR 



OEXITAL BRAXCH 

 OF aEXlTO-CRURAL 



CRURAL BRANCH OP 

 GKXITO-CRVRAL 



ILIO-ING UINAL 



DISTRIBU- \ 



TlllX OF 

 EXTERNAL 1 

 CUTANEOUS 



CRURAL 

 BRANCH 

 OF O KN I TO- 

 CRURAL 



AORTIC 



LAST THORACIC NER VE 



ILIO-HYPO- 

 GASTRIC 



ILIO- 



INHVIKA.L 



THIRD 

 LUMBAR 

 .\ER VE 



CFK I TO- 

 CRURAL 



EXTERN A L 



CUTANEOUS 



GENITAL 

 BRANCH 

 OF 



(1ENITO- 

 CRURAL 



CRURAL 

 HHAM'll OF 

 IJKXITO- 

 I-RI'RAI. 



OKTC- 



RA TOR 



SACRAL 



Pl.EXUH 



FIG. 190. BRANCHES OF THE LUMBAR AND SACRAL PLEXUS, VIEWED FROM BEFORE 

 (After Hirschfeld and Leveilte.) 



5. External cutaneous, emerges from the outer side of psoas, crosses iliacus 

 under the iliac fascia, leaves pelvis under crural arch, below anterior superior 

 spine of ilium, pierces deep fascia of thigh, and supplies skin over outer side of 

 thigh, being a dismembered branch of the anterior crural nerve, in reality. 



6. Obturator, emerges from psoas on inner side, lies on outer wall of pelvis, 

 leaves pelvis by obturator foramen, divides into anterior and posterior divisions, 

 separated by the adductor brevis muscle ; (lit anterior division communicates with 

 the internal cutaneous and long saphenous nerves, forming the subsartorial 

 plexus for the supply of the skin over the insertion of the adductors Hilton's 



