ORIGIN AND DISTRIBUTION OF THE NERVES. 135 



Second cervical nerve, which makes its appearance between 

 the second and third vertebras. Its superior filament sends 

 branches to the muscles of the neck, and levator humeri, 

 communicates with the accessory nerve, and 



Third cervical. This also send branches and twigs to the 

 different muscles of the neck, and communicates with the 

 fourth. 



The fourth, fifth, sixth, and seventh pairs pass from the 

 spine, between their respective vertebrae, and send branches 

 to the phrenic nerve, and ramifications to the muscles, sym- 

 pathetic nerve, and unite with the dorsal. 



THE DIAPHRAGMATIC, OR PHRENIC NERVE. 



This is formed by branches from several of the cervical 

 nerves: It takes its course down along the inferior border 

 of the scalenus muscle. It terminates by numerous ramifi- 

 cations on the tendinous parts of the diaphgram. 



DORSAL NERVES. 



These consist of eighteen pairs. They pass from the ver- 

 tebral canal in the same manner as the cervical, having supe- 

 rior and inferior branches. The inferior branches follow the 

 course of the intercostal blood-vessels, and are called inter- 

 costal nerves. The superior branches are distributed to the 

 back and loins. 



LUMBAR NERVES 



Consist of five pairs, (corresponding to the number of the 

 lumbar vertebrae.) 



The first nerve ends in ramifications near the stifle, and 

 gives off branches to the last dorsal nerve, to the sympathetic, 

 and to the second lumbar nerve. 



The second nerve has communication with the first nerve, 

 and sympathetic ; also the crural. It sends one division to 

 the fore part of the haunch, where it becomes sub-cutaneous, 

 and ramifies over the stifle. The other division crosses the 



