REPORT ON THE SPHENISCID^. 149 



VI. — The Ovarian Artery 



Comes off from the abdominal aorta, half an inch behind the origin of the superior 

 mesenteric artery. It passes to the left side, and after giving off a branch for the supply 

 of the anterior half of the oviduct, terminates in the substance of the ovary, 



VII.— The Renal Arteries. 

 These are three in number on each side. The two anterior come off from the aorta 

 half an inch in front of the crural artery. They pass outwards and backwards, and supply 

 the anterior or larger of the two renal lobes. The posterior renal artery arises from the 

 aorta behind the origin of the crural, and passes outwards to supply the posterior or smaller 

 of the lobes of the kidney. All three arteries inosculate freely with one another in the 

 substance of the kidney. 



VIII.— The Lumbar Arteries 

 Are in series with the intercostals. They are of small size, and arise partly in front 

 of and partly behind the renal arteries. They are distributed somewhat irregularly to the 

 superior and lateral abdominal walls. 



IX. — The Inferior Mesenteric Artery 

 Is given off from the abdominal aorta close to its termination. It passes backwards 

 between the folds of the meso-rectum,. and supplies the great intestine between the cceca 

 and cloaca. 



X. — The Hypogastric Arteries 

 Are two in number. They leave the aorta opposite the last lumbo-sacral vertebra, and 

 accompany the ureters as far as the cloaca, which together with the bursa fabricii they 

 supply. 



XL— The Middle Sacral Artery. 

 This, the termination of the aorta, extends backwards, lying along the inferior middle 

 line of the coccygeal vertebrae. It terminates by breaking up into small branches for the 

 supply of the depressores coccygis muscles and neighbouring parts. 



XII.— The Crural Artery 



Arises from the abdominal aorta in front of the posterior renal artery. It passes 

 obliquely outwards and backwards above the fissure which separates the two lobes of the 

 kidney, and escapes from the abdominal cavity by passing over the anterior border of the 

 iliac bone. It then passes along the inner side of the thigh, lying under cover of the 



