Figure 90-2

FIGURE 90-2 Division of lymph nodes by level. A system of five levels of lymph node groups in the lateral neck is used clinically to describe lymph node location. Level I includes submental and submandibular groups. Level II is upper jugular lymph nodes. Level III is middle jugular lymph nodes. Level IV is lower jugular lymph nodes. Level V is posterior cervical lymph nodes. A variably used designation is level VI, for lymph nodes of the anterior cervical compartment.