lymph node of head mastoid lymph node FMA:61215 SCTID:245328002 SCTID:279143009 The mastoid lymph nodes (retroauricular lymph nodes, posterior auricular glands), usually two in number, are situated on the mastoid insertion of the Sternocleidomastoideus, beneath the Auricularis posterior. Their afferent vessels drain the posterior part of the temporoparietal region, the upper part of the cranial surface of the auricula or pinna, and the back of the external acoustic meatus; their efferents pass to the superior deep cervical glands. postauricular lymph node retro-auricular node mastoid node retro-auricular lymph node Wikipedia:Mastoid_lymph_nodes