INTRAVENOUS INJECTION. 89 



the skin should be carefully disinfected preferably with 

 tincture of iodine. The vein lies in the jugular groove 

 between the mastoido-humeralis and the sterno-maxillaris 

 muscles covered only by the skin and skin muscle. 



Stand by the shoulder of the horse and compress the 

 jugular with the thumb as shown in Figure 6 or with the 

 second to the fourth fingers, in which case the ball of the 

 thumb rests on the mastoido-humeralis muscle, in a way that 

 the vein becomes filled above the point of compression in the 



Fig. 6. 



Intravenous Injection. 



shorn area and stands out as a swollen cord. In the case 

 of fleshy necked horses efficient compression is more readily 

 attained if the head is somewhat elevated and extended by 

 an assistant. If the vein cannot be made prominent in this 

 way the compression should be alternately applied for a 

 time and then withdrawn suddenly, when the course of the 

 vein reveals itself by a wave-like movement along the 

 jugular groove. 



