The lymphatic drainage to central pa of the lip is
Submental lymph nodes: these are three or four nodes situated across the midline below the chin in the submental triangle. Lymphatics of the central pa of the lower lip drain to the submental nodes,the lymphatics from the rest of the lower lip pass to the submandibular nodes. REF.BDC VOL.3,FIFTH EDITION
Submandibular node
Submental nodes
Deep cervical nodes
Jugulodiagastric nodes
Head and neck