ARTERITIS AND THROMBOSIS, 357 
‘Ing thrills. The external pudic artery communicated with a large venous 
‘division of the sheath. 
In subjects of the bovine species, Moreau has seen two arterio-venous 
‘aneurisms of the face developed on the course of the facial artery and vein. 
In one, there was also exophthalmy, due to the dilatation of the ophthalmic 
veins. 
Where sttgical interference is decided upon, bloody manipulation, with 
strict antisepsy, forms the proper treatment. The double ligature of the 
artery above and below the sac must be applied on the aneurismal varix. 
In all the other cases, both ends of the artery and of the vein must be 
ligated (Delbet). If the sac is large, ligature must Ve followed by extirpa- 
tion (Trelat). In cattle, Gurlt, Prinz, Meyer, have treated by excision 
the arterio-venous aneurism of the great testicular without any accident 
following. 
Iv. 
ARTERITIS AND THROMBOSIS. 
Any inflammation existing in the tissues surrounding an artery, may 
‘spread on it and give rise to serious lesions. Some arteritis are embolical 
in their nature; others start in the course of infectious diseases, progress 
-quietly and become manifest only much later on, by functional disturb- 
ances due to secondary thrombosis. 
Obliterations or arterial thrombosis deserve a special study on account 
-of their peculiar symptoms. Assisted by the diminution of the circulatory 
current (Virchow), the principal part in their formation is due to arteritis 
-and embolies. The clot may be parietal, incompletely close the caliber of 
‘the vessel and diminish the circulation; but it may also prevent it en- 
tirely. At first very thin, this clot generally develops in the direction of 
the circulatory current as far as the first collateral ; it gradually increases in 
‘size ; sometimes the vessel which contains it is bosselated. Its color is 
-yellowish or reddish, its consistency more or less firm; it seems formed 
‘by layers successively deposited upon a primary nucleus. The muscles 
‘which receive blood from. thrombosed vessels present no important altera- 
tion ; yet Bouley Jr. has found them “ pale, discolored, and less consistent 
‘than in normal state.” 
Besides traumatic thrombosis, arterial obliterations are frequently found 
in horses ; their pathogeny is yet uncertain. Thrombosis of the posterior 
aorta is most common. Some authors, Goubaux among them, have ac. 
‘cused the laceration, of the walls of the aorta, produced at a moment when 
the animal made a bad slip. . But it is probable that these thrombosis 
originate most commonly from infectious causes. 
