<prompt> Which of the following lymph nodes are known as Delphic nodes?PretrachealParatrachealSupraclavicularPosterior triangle  <response>: There is extensive lymphatic network seen in thyroid. Although some lymph channels pass directly to the deep cervical nodes, the subcapsular plexus drains principally to the central compament juxta thyroid - Delphian or pretracheal - and paratracheal nodes and nodes on the superior and inferior thyroid veins, and from there to the deep cervical and mediastinal groups of nodes. 