phylum. 1  Biology. the primary subdivision of a taxonomic kingdom, grouping together all classes of organisms that have the same body plan. 2  Linguistics. a category consisting of language stocks that, because of cognates in vocabulary, are considered likely to be related by common origin. Compare stock (def 13).
There are between 500 and 600 lymph nodes in the average adult human body.
Structure [edit]. There are approximately 300 lymph nodes in the neck, and they can be classified in many different ways. Commonly used systems have been devised by the American Academy of Otolaryngology and the American Joint Committee on Cancer.One system divides the nodes as follows:1  Level I: Submental and submandibular nodes.or lymph nodes near the cervix, see external iliac lymph nodes and inguinal lymph nodes.