A group of nodes lying along the external jugular vein; they drain the skin and superficial structures over the region of the sternocleidomastoid muscle and anterior cervical regions. Efferent vessels drain to the deep cervical lymph nodes. Lymph nodes can be further subdivided into anterior and lateral groupings. [ https://github.com/obophenotype/uberon/issues/5 ref:Stedmans http://en.wikipedia.org/wiki/Superficial_cervical_lymph_nodes http://purl.obolibrary.org/obo/CL_tm ]