Neuroimmunology is a field combining neuroscience, the study of the nervous system, and immunology, the study of the immune system that includes interaction between our central nervous system (the brain and spinal cord) and our immune system. Neuroimmunology contributes to development of latest pharmacological treatments for many neurological conditions. This immune system along nervous system maintains large communication, together along with hardwiring of sympathetic and para-sympathetic nerves to lymphoid organs. Neurotransmitters like acetylcholine, norepinephrine, vasoactive intestinal peptide, substance P and histamine modulate immune activity.