IA
Submental

- Between anterior belly of the digastric and hyoid
- Mets from floor of mouth, anterior oral tongue, anterior mandibular alveolar ridge, and lower lip.

IB
Submandibular

- Between anterior and posterior bellies of the digastric, the stylohyoid, and the body of the mandible.
- Radiographically, the vertical plane at the posterior aspect of the submandibular gland separates posterior IB from IIA

IIa & IIB
Upper jugular

- Upper third of IJ from the skull base (above) to the inferior border of the hyoid (below); lateral border of the sternohyoid and the stylohyoid (medial) to the posterior border of the SCM (lateral).*
- Sublevel IIA and IIB nodes are divided by the spinal accessory nerve.
- Mets from oral cavity, nasal cavity, nasopharynx, oropharynx, hypopharynx,
larynx, and parotid gland.

III
Middle jugular

- Middle third of IJ from the inferior border of the hyoid bone (above) to the inferior border of the cricoid cartilage (below); lateral border of the sternohyoid (medial) to the posterior border of the SCM (lateral).*
- Mets from oral cavity, nasopharynx, oropharynx, hypopharynx, and larynx.

IV
Lower jugular

- Lower third of IJ from the inferior border of the cricoid cartilage (above) to the clavicle (below); lateral border of the sternohyoid (medial) to the posterior border of the SCM (lateral).*
- Mets from hypopharynx, cervical esophagus, and larynx.

VA & VB
Posterior cervical

- Along lower half of CN XI and the transverse cervical artery. From the convergence of the SCM and trapezius (above) to the clavicle (below); the posterior border of the (medial),* to the anterior border of the trapezius (lateral).
- Sublevels VA and VB separated by a horizontal plane at the inferior border of the cricoid cartilage.
- Mets from the nasopharynx and oropharynx (Sublevel VA), and the thyroid gland (Sublevel VB).

VI
Anterior, visceral

- Between the hyoid bone (above) to the suprasternal notch (below), and the common carotid arteries.
- Mets from the thyroid gland, glottic and subglottic larynx, apex of the piriform sinus, and cervical esophagus.

VII
Superior mediastinal

- Top of manubrium (above) to innominate vein (below); between common carotid arteries laterally