HEAD AND NECK OF THE HORSE 



15 



of the mandible. Traced backwards, it will be found to pursue an 

 oblique course between the mandible and the mylo-hyoid muscle. The 

 terminal part of its course is related to the submental artery. 



N. auricularis magnus. 



Parotid gland, i 



2nd cervical nerve. i i 



M. rhomboideus (cervic 

 M. splenius 



M. trapezius (cervicalis) 

 1 



'S, 

 Ramus colli. 

 V. maxillaris externa. 



M. sternocephalicus. 



N. accessorius. 



"M. serratus ventralis. 

 M. brachiocephalicus. 



Fig. 6 



— Dissection of the lateral aspect of the neck. First stage. 



Dissection. — The skin must now be removed from the whole of the 

 side of the neck. During the process a series of cutaneous nerves will be 

 observed piercing the brachio-cephalic muscle at fairly regular intervals. 

 These are derived from the ventral primary branches of the cervical 

 nerves, from the second to the sixth inclusive. Other cutaneous nerves, 

 also in series, appear nearer the mid-dorsal line of the neck. These are 

 rami from the dorsal ]-)rimary branches of the spinal nerves. 



As early as possible the accessory nerve should be secured. This 

 nerve is of some size and there will be little difficulty in finding it at the 

 dorsal border of the brachio-cephalic muscle about the middle of the neck. 



The examination of the cervical part of the trapezius and rhomboid 

 muscles should be conducted by the dissectors of the head and neck and 

 those of the thoracic limb working together. 



