500 



OPERATIONS ON THE CIRCULATORY SYSTEM. 



Fig. 444.— Anatomy of the Cephalic Vein, m, Median subcutaneous vein; b, basilic 

 ■vein; c, cephalic vein; d, inferior extremity of the coraco-radialis; t, aponeurotic band 

 extending from the coraco-radialis to the anterior extensor of the metacarpus; s, ster- 

 no-humeralis; h. mastoido-humeralis; «, space between these two muscles; /, humeral 

 vein. 



On account of the presence of the other terminal branches of 

 the main vein, from which the cephahc rises, viz., the basihc, pres- 

 sure upon the cephahc does not allow of its dilatation. To obtain 

 this, the animal must be exercised for some time, and when 

 brought to stand still, to raise the opposite leg, or to carry the 

 leg to be bled forward. 



As the vein is easily displaced from its position, it is hardly 



