The immune system of our body is a complex system made up of different structures, viscera and organs that work in harmony with a purpose: protect our body from external aggressions of infectious agents (both viruses and bacteria), and in some cases directly involved in various important functions such as acting as a filter circulation or participate in the transport and absorption of nutrients. This is the case of the spleen, formed by cells, especially by-lymphocytes and blood we found in the abdomen to the right of the stomach.
The lymph nodes are also part of our immune system. They consist of small, oval and encapsulated structures that are interspersed throughout the course of the lymphatic vessels, sometimes quite scattered throughout our body and in some areas are grouped in larger numbers (that is what happens to areas such as the neck, armpits and groin). Inside we find fibrous trabeculae through which flows the lymph.