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.
Part of the immune system is the lymph system, which includes hundreds of nodes that are located throughout the body. They are instrumental in fighting infection, illness, and disease. There are about 25 axillary lymph nodes that are located in the armpit area.They drain fluid from the breasts and surrounding area.They can become swollen, sensitive, or enlarged when there is a health problem, like a breast infection or cancer.he sentinel nodes are commonly the ones closest to a tumor anywhere in the body. The axillary nodes are only located in the armpit area. These can become very painful when swollen or enlarged when there is illness, infection, or disease present.