Neck Lymph Node Boundary Level III

**Semantic type:** Finding

**Definition:** The following anatomical structures define the neck lymph node boundary for level III: Superior: horizontal plane defined by the inferior body of the hyoid; inferior: horizontal plane defined by the inferior border of the cricoid cartilage; anterior (medial): lateral border of the sternohyoid muscle; posterior (lateral): lateral border of the sternocleidomastoid or sensory branches of the cervical plexus. (AJCC 8th ed.)

**Synonyms:** - CERVICAL LYMPH NODE LEVEL III