1 06 The Anatomy of a HORSE. 



vrider, as has been obferv'd, and its Motion is in many 

 Places diredtly upwards, yet nothing can happen in a na- 

 tural Way to retard its Progrefs. 



But I (hall retain the Reader no longer with the Diffe- 

 rence between the Veins and Arteries, believing what has 

 been already faid, Tufficient to give any one a Notion of 

 their feveral Offices ; I (hall therefore proceed to give fome 

 Account of the Order and Diftribution of the Veins, as 

 they correfpond with the Arteries. 

 The Cava. ^^ ^^ ^^^^^ Artery receives the Blood 



from the Heart, and dillributes it from 

 thence into all Parts of the Body ; fo the Cava^ like a 

 main River, receives into it the Blood which is conveyed 

 from all Parts of the Body, proceeding at firft from Vellels 

 infinitely fmall, and afterwards uniting in large Branches, 

 which empty themfelves into its fuperior and inferior 

 Trunks at proper and convenient Diftances. 

 <Ihe dejcendinz '^^^ f^perior, or defcending Cava, re- 

 Cava. ceives firft the Coronary Vein from the 



Heart, near that Place where it opens into 

 the Ear. As foon as it pierces the Pericardium, it receives 

 the Vena fine pari, which is made by the Union of the 

 yeins of the Ribs on each Side. 



r, T\-n -i .;.« The Subclavian and Jugular Veins are 

 ^ pretty large Vellels, which anfwer to the 



Subclavian and Carotid Arteries, and are the next of any 

 Note that open into the defcending Cava. The Jugulars 

 are divided into the External and Internal ; the External 

 is that large Vein which runs along the Outfide of the 

 Neck, called in a Horfe the Neck-vein, and is moll com- 

 monly opened when Blooding is required. This Vein re- 

 ceives and carries back that Portion of the Blood which 

 comes from all the external Parts of the Head and Face, 

 viz. from the Eye- veins, the Temple- veins, and thofe of 

 the Nofe and Lips. Into the Internal Jugulars open all 

 thofe Veins which lie within the Bars of the Mouth, and 

 under the Tongue, and all the other Branches which com- 

 municate with thofe of the Brain. 



The Subclavian Veins, viz. the two large Branches 

 which pafs under the Channel-bones, not only receive a 

 great Part of the Blood which comes from the Cheft, but 

 likewife have all thofe Veins open into them, which run 

 along the outward Part of the Breaft, Fore-legs, and Feet, 

 fuch as the Breaft-veins, that run between the Fore-legs, 



which 



