The Level I lymph node groups in the neck include which regions?

• A. Submental and submandibular regions
• B. Jugulo-omohyoid and posterior cervical
• C. Submandibular and deep cervical
• D. Parotid and retroauricular

Answer: (A)

Level I lymph node groups in the neck are the submental and submandibular nodes. They sit under the chin and along the mandible and form the first drainage route for the oral cavity and floor of the mouth. The submental nodes collect from the chin, lower lip, floor of the mouth, and tip of the tongue, while the submandibular nodes drain much of the face and oral cavity, including areas like the cheek, anterior tongue, and parts of the lips and palate. Because Level I is this anterior, submandibular/Submental area, the regions listed in the other options lie along pathways outside Level I (such as the internal jugular/posterior triangle regions or the parotid/retroauricular drainage), so the correct pairing is submental and submandibular regions.