188 



APPLIED PHYSIOLOGY 



and they mark the course of the tubes in case they should need to be 

 compressed to stop bleeding. 



323. Repair of wounded tubes. When a vein is cut 

 in two, its ends may grow together again, but when an 

 artery is cut, each end of the tube remains permanently 



The left upper arm. 



The dotted line indicates the 

 course of the main artery (the 

 brachial). 



The right thigh. 



The dotted line indicates the 

 course of the main artery (the 

 femoral) . 



closed, and thus the supply of blood to the part is at least 

 partly cut off. Branches from an artery communicate 

 with other branches which begin a few inches further 

 down the same artery. When the artery is cut, these 

 communicating branches enlarge, and thus permit the 

 natural amount of blood to flow around the wound and 



