92 SURGICAL ANATOMY OF 



otid above the omo-hyoid, where the vessel is most 

 superficial, and immediately beneath the skin, platysma, 

 and superficial fascia, and a complicated plexus of veins. 

 The posterior belly of the digastric and its attendant 

 muscle, the stylo-hyoid, should be drawn upwards 

 towards the jaw, and the sterno-mastoid outwards ; the 

 superior laryngeal branch of the vagus lies usually just 

 behind its short trunk. 



The collateral circulation after ligature of the external 

 carotid would be readily maintained by its branches 

 anastomosing so freely on the face with those of the op- 

 posite side, and by the terminal branches of the inter- 

 nal carotid (supra-orbital, ethmoidal, palpebral, and 

 nasal) with the facial, and by the profunda and princeps 

 cervicis. 



(This operation is not often resorted to in the prac- 

 tice of surgery, as it is preferable to tie the common 

 trunk.) 



Tenotomy. The attachments of the sterno-cleido- 

 mastoid to the clavicle and sternum occasionally require 

 division, subcutaneously, for the relief of wryneck or tor- 

 ticollis, and considerable caution is requisite in this ap- 

 parently simple operation, as there is a danger of wound- 

 ing the external jugular vein as it passes into the internal 

 jugular, or even more important vessels, if it be clumsily 

 or hastily performed. 



SURGICAL ANATOMY OF THE SUBCLAVIAN REGION 



(OR REGION OF THE THIRD PART OF THE 



SUBCLAVIAN ARTERY). 



This region receives its name from the fact of its con- 

 taining the third portion of the subclavian artery, and 

 on account of its being the most common seat of opera- 



