Level IV—from the inferior aspect of the cricoid to the top of the manubrium of the sternum and anterior to the posterior border of the sternocleidomastoid muscle.
Level V—posterior to the sternocleidomastoid muscle and anterior to the trapezius muscle above the level of the clavicle.
Level VI—below the hyoid bone and above the jugular (sternal) notch in the midline.
Level VII—below the level of the jugular (sternal) notch.
In the clinic