Il8 EQDlNE ANATOMY. 



femoj'is, and posterior gluteal to glutei, triceps cruris and sensa- 

 tion to posterior part of thigh. 



Great sciatic emerges from great sciatic opening, passes along 

 posterior part of thigh on adductors, between two heads of gas- 

 trocnemii, along inner side of hock, and ends in external and 

 internal plantars. 



Branches. 



Muscular to obturator internus, gemelli, quadratus femoris, 

 triceps cruris, semi-tendinosus, semi- membranosus, great adductor 

 of thigh, and posterior tibial muscles. 



Exter?ial popliteal diUSQ?, near gemelli muscles, passes down- 

 ward and outward to upper part of leg, where it terminates in the 

 ?nusculo-cuta7ieous, which supplies the extensors of the phalanges 

 and skin of metatarsal region, and anterior tibial, which lies to 

 outer side of artery, giving off muscular and cutaneous branches. 



Branch. 



Peroneal-cutaneous, with external saphenous vein to skin of 

 leg. 



Plantar nerves pass to outer and inner sides of metatarsus, and 

 are distributed like the analogous structures in the anterior foot. 



DORSAL NERVES. 



Divided into superior branches, which supply skin and muscles 

 of spinal region, and inferior, which send branches down into the 

 intercostal spaces to muscles of chest, by first seven pairs, and 

 muscles and skin of abdomen by remainder. In the middle of 

 their course they give off a cutaneous branch, which supplies the 

 skin and cutaneous muscles. The first and second form part of 

 the brachial plexus. 



THE SYMPATHETIC NERVOUS SYSTEM. 



This consists of two long cords lying under the spinal column, 

 from the head to the tail, probably ending in a ganghon under 

 the coccygeal vertebrae. 



In its course are many ganglia, which are composed of the 

 gelatinous fibres of Eemak, and send branches to the cerebro- 

 spinal system, viscera and blood-vessels, forming the vasomotor 

 system. 



