392 NAVIN ox THE HORSE. 



go to the breast, neck, head, brain, and fore-limbs. Some of 

 these deserve particular notice. 



The left of these divisions is lost in a number of branches, 

 or trunks, which are distributed to various parts of the chest, 

 shoulder, back part of the neck, and left fore-limb. The most 

 important of these branches is the one which supplies the left 

 fore-limb. It is the aocillary artery, or artery of the armpit. 

 It comes out of the chest, by a sudden turn around the first 

 rib, and takes a direction outward and backward, and reaches 

 the head of the upper arm-bone, and is then called the brach- 

 ial artery. This artery gives off many branches to supply 

 the muscles of the chest and shoulder. The branch called the 

 humeral passes down the back side of the humerus, or upper 

 arm-bone, giving off branches, and finally divides into three 

 branches, the principal of which continues down the lower arm^ 

 bone, until a short distance above the knee, when it divides 

 into two branches, the smaller one passing by the inner and 

 back part of the knee, and terminating in several branches. 

 The larger of these arteries continues on down below the knee, 

 along the principal tendons at the back of the cannon-bone, 

 down to the fetlock, where it divides into three branches. 

 These send off many branches to supply the parts about the 

 pasterns and within the foot. 



The right division of the forward aorta is much the largest. 

 It first gives off branches similar to those of the left division 

 just described, to be distributed to the chest, neck, shoulder, 

 and right fore-limb. Its principal division then becomes what 

 is called 



The common carotid artery, which passes out at the forward 

 part of the chest, and there divides into 



The right and left carotid arteries, which pass up the neck, 

 one on each side of the windpipe, until they reach its upper 

 portion or larynx. Here each carotid divides into two 

 branches, the one called the internal carotid artery and the 

 other the external. The internal is distributed to the brain 



