<prompt> At which level does the Common Carotid Aery end?Level of Hyoid boneUpper border of cricothyroid membraneUpper border of cricoid cailageUpper border of thyroid cailage  <response>: At the level of the upper border of the thyroid cailage, in the carotid triangle, the common carotid aery ends by dividing into the external and internal carotid aeries on the right and left sides. 