116 AVES. 



13. Anterior crural nerve: it is formed by the first, second, and third lumbar 



nerves, and is accompanied by a small artery ; it is given to the muscles 

 which are in the place of the gluteal, the tensor of the fascia of the thigh, 

 the straight muscle, the external and internal vast, and the crural, and sends 

 off a slender branch, the saphenus, to be joined by another from the obturator 

 to pass down on the inner side of the leg. 



14. Obturator nerve : it arises from the second and third lumbar nerves, and after 



giving off the branch to join the saphenus, terminates on the obturator and 

 pectineal muscles. 



15. Sciatic nerve : it arises from six nerves below the third lumbar, and is accom- 



panied by the femoral artery into the thigh ; after giving branches to the 

 adductor and the flexors at the back of the thigh, which are in the place of 

 the biceps, the semimembranous and semitendinous, it passes down and 

 divides into the posterior tibial and peroneal nerves; the posterior tibial 

 divides into two portions. 



16. One division of the posterior tibial nerve : it gives branches to several muscles 



corresponding with the inner part of the gastrocnemius, the posterior tibial 

 and the flexors of the toes, and sends one down to the skin at the inner side 

 of the leg. 



17. Another division of the posterior tibial nerve given to the heads of muscles 



forming the outer part of the gastrocnemius. 



18. A branch of the peroneal nerve passing down the leg behind the tendons 



towards the outer malleolus, and from thence to be distributed on the sole of 

 the foot. The course of this corresponds with that of the posterior tibial in 

 mammalia. 



19. The peroneal nerve : it passes to the outer side of the leg and gives branches 



to the muscles, corresponding with the peroneal, the anterior tibial, and the 

 extensor of the toes. 



20. The anterior tibial nerve of the peroneal : it passes between the peroneal 



muscle and the extensor of the toes, and under the annular ligament, and 

 gives a branch to the inner side of the first or inner toe, and another to 

 divide for the outer side of the first toe and the inner side of the second. 



