276.The answer is d.(Moore and Dalley, pp 952, 990.)Lymph from the
medial portion of the lower lip preferentially drains through the submental
nodes in the chin and metastases may first appear here. Lymph from the
upper lip and lateral portions of the lower lip drains preferentially through
the submandibular nodes (answer a)on the inferolateral aspect of the
mandible. The parotid nodes (answer b)receive lymph from upper and
436 Anatomy, Histology, and Cell Biology