TSE LVMBO-SACBAL PLEXUS. 

 Fig. 355. 



771 



LUMBO-SACRAL PLEXUS AND IHTEENAL NEEVES OF THE POSTEEIOK LIMB. 

 1, 1, Lumbo-sacral plexus ; 2, Anterior femoral nerve ; 3, Internal saphena nerve ; 4, 

 Obturator nerve ; 5, Originating fasciculus of the great and small fcmoro-popliteal 

 nerves ; 6, Superficial ramuscules of the posterior gluteal nerves ; 7, Great 

 femoro-popliteal nerve ; 8, Internal pudic nerve ; 9, Hajmorrhoidal, or anal 

 nerve; 10, Internal plantar nerve; 11, 12, Its digital ramifications. 



>;fOTE. Tn the above figure is seen the posterior part of the plexus fonned by the nervous branches which 



pass through the three first subsacral foramina. That which escapes from the foramen between the sacrum 

 anc" last lumbar vertebra, only gives a fine branch to this part of the plexus, and sends the greater portion of 

 its fibres In two cords, to the anterior part. This arrangement Is not rare, and Is generally seen, we bclievi-, 

 when theVe a' e only five lumbar vertebra : as is remarked in the Ass and Mule, and sometimes in the Horse. 

 It will therefore, be understood that the nerve described by us as the fir.st sacral becomes the last lumbar. 



