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Lymph node from level III (middle jugular nodes) extend from the level of the bottom of the body of the hyoid bone to the level of the bottom of the cricoid arch. They are located around the middle third of the internal jugular vein.
The anterior (medial) boundary is the lateral border of the sternohyoid muscle and the posterior (lateral) boundary is the posterior border of the sternocleidomastoid muscle (they also lie lateral to the medial margin of either the common carotid artery or the internal carotid artery, separating them from the level VI that is medial).