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First echelon lymph nodes for various primary sites
| Level 1 | Oral cavity, oropharynx |
| Level 2 | Oral cavity, oropharynx, larynx, nose, hypopharynx, parotid, nasopharynx |
| Level 3 | Oral cavity, oropharynx, larynx, hypopharynx, thyroid, nasopharynx |
| Level 4 | Larynx, thyroid, hypopharynx, oesophagus |
| Level 5 | Nasopharynx, hypopharynx, thyroid, oropharynx |
| Level 6 | Thyroid, larynx, hypopharynx, cervical oesophagus |
