32 FISTULA AND POLL-EVIL 



the cervical region. The posterior branches 

 pass upward between the dorso-seapiilar Hga- 

 ment and the rhomboideus and thence to the 

 snperficial mnscles and skin. These radicals 

 are normally small vessels, bnt in old fistula 

 they are often enlarged into arteries of a 

 formidable capacity. The main trunk lying 

 deeply in the base of the withers is seldom 

 exposed in surgical operations. The variation 

 in the distribution of these branches and 

 especially the enlargement of some of them 

 under the influence of disease make the study 

 of the blood supply of the withers somewhat 

 unsatisfactory from the surgical standpoint. 

 There is always a pronounced difference in the 

 amount of bleeding produced from incisions 

 of exactly the same kind. 



The eoctra'tJioracic distiihution of the deep 

 cervical artery. — Emerging from the fiist 

 intercostal space, it passes upward and for- 

 ward between the lamellar portion of the 

 ligamentum nuchge and the complexus. It 

 destination is the region of the poll where it 

 anastomoses with branches of the occipital. 

 Along its course along the neck it exhibits free 

 commimications with the vertebral and sup- 

 plies by lateral branches the lateral cervical 

 muscles. These lateral branches of the deep 

 cervical which enter the splenitis and serratus 



