46 THE NECTURUS 



The external and internal carotids arise from the first 

 efferent artery. The three efferent vessels join to form 

 the roots of the aorta. 



The vessels coming from the aorta are: 

 Pulmonary artery from the roots of the aorta 

 Vertebral artery from the roots of the aorta 

 Subclavian 



Cutaneous 

 Small spinal arteries to the body wall 

 Gastric artery 



Splenic 

 Coeliaco-mesenterie 



Splenic 



Hepatic 



Coronary 



Intestinal arteries 



To ovaries and testes 

 Posterior mesenteric arteries 



Numerous branches to intestines 

 Iliac artery 



Small artery to anal gland 

 Small artery to the caudal muscles 



The aorta ends in the tail as the caudal. 



An efferent artery takes the blood from each of the 

 three gills to the aorta. Remove the skin from the dorsal 

 side of the gills and locate the three dorsal vessels. The 

 external and internal carotids extend from the first efferent 

 vessel. A small anastomosing vessel connects the first and 

 second efferent arteries, while the second and third 

 efferent arteries form the roots of the aorta. 



Subclavian Artery 



Dissect in on the ventral side of the leg to find the 

 subclavian artery extending along it. If the specimen is 

 well injected, it may be followed to the individual muscles. 

 The cutaneous extends to the pectoral muscles and to the 

 posterior part of the body. Follow the subclavian back 

 to its origin a few millimeters posterior to the joining of 

 the roots of the aorta. 



