Lymph nodes located around the middle third of the internal jugular vein extending from the inferior border of the hyoid bone (above) to the inferior border of the cricoid cartilage (below). The anterior (me- dial) boundary is the lateral border of the sternohyoid muscle, and the posterior (lateral) boundary is the posterior border of the stern- ocleidomastoid muscle.* (Included in this group is the jugulo-omo- hyoid node, which lies immediately above the superior belly of the omohyoid muscle as it crosses the internal jugular vein.) These nodes are at greatest risk for harboring metastases from cancers arising from the oral cavity, nasopharynx, oropharynx, hypopharynx, and larynx (Figure 3).