PLATE LXX. 

 POSTERIOR WALL OF ABDOMEN-LUMBAR PLEXUS. 



This dissection is a continuation of same subject as in the last plate. The inferior 

 vena cava and the remains of the liver have been removed, exposing the right splanchnic 

 nerve, semilunar ganglion, and crus of diaphragm ; the lumbar arteries are seen coming off 

 from the aorta. The kidney, psoas parvus, and magnus have been removed on the left side 

 to allow the lumbar plexus to be dissected out. The communications with the sympathetic 

 are well seen. The ilio-lumbar artery is given off from the common iliac instead of the 

 posterior trunk of the internal iliac, and this mode of origin is by no means uncommon 

 On the left side the body of the pubes has been removed to expose the internal iliac 

 vessels and their branches. 



The following diagram shows a scheme of the lumbar plexus ; the posterior 

 divisions of the nerves have been shaded. The so-called accessory obturator would be 

 better named ' accessory anterior crural,' (1) because in its origin it is more nearly allied 

 to that nerve ; (2) because of its course over the pubic ramus ; (8) because it supplies 

 a portion of the pectincus muscle in place of the anterior crural. 



ILIO-HYPOGASTRIC _: 



Traosvc^alis -,NGUINAL //, 



Infernal Oblique 



GENITO CRURAL 



Skin of thiyh 

 Cremaster 



EXTERNAL CUTANEOUS, 

 Skin 



Muscular 

 to Iliacus 



ANTERIOR CRURAL 



Skin front &. inner side of thigh 



inner side, of ley & foot 

 Quadriceps Extensor 

 Sartonus Pectmeus. 

 KNEE JOINT SttwiqroHIP. 



ACCESSORY 



OBTURATOR 



Rectmeus 



QUADRATUS LUMB 

 Psoas 



Ond 



ilMDRATUS LUMB 



Psoas. 



QUADRATUS LUMB: 

 Psoas 



^.'H 



To join 



Lum bo -sacral 

 cord 



OBTURATOR 



Adductor longus 

 brevis 



magnus 

 Rectmeus (8% of cases) 

 Gracilis 



External Obf'uracor 

 HIP& KNEE JOINTS Sk,n 



