"level IIa: inseparable from or anterior to the posterior edge of the internal jugular vein; includes jugulodigastric nodal group"
"level IIb: posterior to and separable by a fat plane from the internal jugular vein"
"level Va: superior half, superior to inferior border of the cricoid cartilage (posterior to levels II and III); includes spinal accessory nerve"
"level Vb: inferior half, inferior to inferior border of the cricoid cartilage (posterior to level IV); includes lateral supraclavicular nodes 1"
"Other classification systems include some of these regions, but a consensus approach has not been reached. For example, with respect to "level VII," radiologists may apply this label to superior mediastinal nodes 2, radiation oncologists may apply this label to "prevertebral nodes" 3, and head and neck surgeons omit this level from their nomenclature altogether 1. Thus, it is best to name lymph node groups outside of the established levels I-VI. If "level VII" is used for superior mediastinal lymph nodes, it should refer to the extension of the paratracheal chain below the suprasternal notch but above the level of the brachiocephalic artery 4."
"Level V: posterior triangle"
Expected headings
"Level I: submental and submandibular"
"Level II: upper internal jugular (deep cervical) chain"
"Level III: middle internal jugular (deep cervical) chain"
"Level IV: lower internal jugular (deep cervical) chain"
"Level V: posterior triangle"
"Level VI: central (anterior) compartment"
"Termination"
"Variant anatomic boundaries"
"Additional neck levels"
"level IIa: inseparable from or anterior to the posterior edge of the internal jugular vein; includes jugulodigastric nodal group"
"level Va: superior half, superior to inferior border of the cricoid cartilage (posterior to levels II and III); includes spinal accessory nerve"
"level Vb: inferior half, inferior to inferior border of the cricoid cartilage (posterior to level IV); includes lateral supraclavicular nodes 1"
"For example, head and neck surgeons may use different intraoperative landmarks 1,4:"