Common carotid aery divides at the level of
At the level of the upper border of the thyroid cailage, the aery ends by dividing into the external and internal carotid aeries. The right common carotid aery is a branch of the brachiocephalic aery. the left common carotid aery is branch of the arch of the aoa. Ref.BDC volume 3 sixth edition pg no: 99
Hyoid bone
Cricoid cailage
Superior border of thyroid cailage
Inferior border of thyroid cailage
Head and neck