IA Submental lymph nodes
IB Submandibular lymph nodes
II Internal jugular (deep cervical) chain from the base of the skull to the inferior border of the hyoid bone
III Internal jugular (deep cervical) chain from the hyoid bone to the inferior border of the cricoid arch
IV Internal jugular (deep cervical) chain between the inferior border of the cricoid arch and the supraclavicular fossa
V Posterior triangle or spinal accessory nodes
VI Central compartment nodes from the hyoid bone to the suprasternal notch
VII Nodes inferior to the suprasternal notch in the upper mediastinum
