r50 



CIRCULATORY SYSTEM OF THE DOG 



The thoracic aorta supplies the last nine or ten pairs of intercostal arteries, 

 but no anterior phrenic arteries. It gives off two or more oesophageal branches, in 

 addition to the broncho-cesophageal, which arises close to or with the sixth inter- 

 costal and ramifies in the usual manner. 



The abdominal aorta, after giving off the external iliac arteries, continues 

 about half an inch to an inch (ca. 1-3 cm.) under the last lumbar vertebra, gives 

 off the internal iliac arteries, and is continued by the middle sacral artery (Fig. 

 624). This small vessel runs backward under the sacrum and coccygeal vertebrae 

 and gives off branches in segmental fashion. Six pairs of lumbar arteries are given 

 off from the aorta, the seventh coming from the internal iliac artery. 



Fig. 618. — Arteries of Distal P.\rt of Right Fore 

 Limb of Dog, Dorsal View. 

 a, Branch of volar interosseoua artery; b, proximal 

 collateral radial artery (lateral branch) ; c, radial artery 

 (dorsal branch); d, rete carpi doraale; e, deep dorsal 

 metacarpal arteries: /, superficial dorsal metacarpal 

 arteries; g, common digital arteries; h, proper digital 

 arteries. 



Fig. 619. — Arterie.s of Distal Part of Right Fore 

 Limb of Dog; Volar View. 

 I, Radial artery; j, ulnar artery; k, volar inter- 

 osseous artery; I, deep volar arch; m, fifth volar meta- 

 carpal artery; n, deep volar metacarpal arteries; p, super- 

 ficial volar metacarpal arteries; o, q, common digital 

 arteries; r, proper digital arteries. 



The cceliac artery gives off the hepatic artery and forms a short trunk from 

 which the gastric and splenic arteries arise. The hepatic artery, after giving off 

 several proper hepatic arteries, and the right gastric artery, which passes along the 

 lesser curvature of the stomach and anastomoses with the left gastric artery, is con- 

 tinued by the gastro-duodenal artery. This divides near the pylorus into right 

 gastro-epiploic and pancreatico-duodenal arteries; the former supplies branches 

 to the pyloric part of the stomach and passes along the greater curvature of that 

 viscus in the omentum and anastomoses with the left gastro-epiploic. The left 

 gastric artery passes to the lesser curvature of the stomach and ramifies chiefly on 



