TEE LUMBOSACRAL FLEX VS. 



773 



arrives outside the pelvis, where it nevertheless remains deeply concealed by 

 the muscular masses on the internal aspect of the thigh. Its terminal rami- 

 fications are expended in the obturator externus, the adductors of the thigh, 

 the pectineus, and the short adductor of the leg. Ti.e branch destined to 

 the latter muscle is the longest ; it leaves the space between the pectineus 

 and the small adductor of the thigh, and descends backwards on the internal 

 lace of the muscle to vhioh it is distributed. 



4. Small Sciatic or Anterior and Posterior Gluteal Nerves. 



The small sciatic of the Horse is composed of several cords that issue 

 from the pelvis by the upper part of the great ischiatie notch, and which have 



Fi?. 356. 



POSTEEIOB PORTION OF THE LUMBO-SACRAL PLEXUS. 

 1 Conioining fasciculi of the three first sacral nerves ; 2, 3, 4, 5 Anterior gluteal 

 neives 6 6', 8, Posterior gluteal nerves; 7, 9, Branches which traverse the 

 g at s'ciatic ligLment, and Lmmunicate between the poster^rghitea^^ranche 

 Ld the divisions of the internal pudic nerve; 10, 11, 12, 1^. "fieat sciatic neive 

 and its crural branches; 14, Small femoro-popliteal nerve; 15 Its cutaneous or 

 peroneal-cutaneous branch. 



been for a long time described as the anterior and posterior gluteal 



""^"^The anterior gluteal or ilio-muscular nerves (Fig. 356, 2 3, 4, 5) are four 

 or five in number, and arise either separately or m groups from the posterior 

 or bye m i"""^" , ■, „iex,is. They appear to be more particularly 



rSed b^th ttoX^^^^ branches' 'ill leave the pelvic cavity by 



£e great sciatic opening, along with the anterior gluteal vessels. The 

 52 



