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The vertebral artery may be divided into four parts:

 

The first part runs upward and backward between the [[Longus colli]] and the [[Scalenus anterior]].

 

In front of it are the [[internal jugular]] and [[vertebral vein]]s, and it is crossed by the [[inferior thyroid artery]]; the left vertebral is crossed by the [[thoracic duct]] also.

 

 

===Second part===