TEE LUMBO-SACRAL PLEXUS. 

 Fig. 355. 



771 



LUMBO-SACRAL PLEXUS AND INTERNAL NERVES OF THE POSTERIOR 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 femoro-popliteal 

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

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

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



NOTE, Tn the above figure is seen the posterior part of the plexus formed by the nervous branches which 

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

 an4 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 believe , 

 when there a?e only five lumbar vertebrae : 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 first sacral becomes the last lumbar. 



