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In many species, the immune system can be classified into subsystems, such as the innate immune system versus the adaptive immune system, or humoral immunity versus cell-mediated immunity.
In humans, the blood–brain barrier, blood–cerebrospinal fluid barrier, and similar fluid–brain barriers separate the peripheral immune system from the neuroimmune system which protects the brain.
The Lymphatic system consists of bone marrow, spleen, thymus and lymph nodes. Bone marrow produces white blood cells, or leukocytes. The spleen is the largest lymphatic organ in the body contains white blood cells that fight infection or disease.
In this amazing lecture series of videos Mobeen Syed explains the human immune system.