I was recently listening to an audio book on Mind/Body Medicine by Deepak Chopra, M.D. One thing that stood out to me was his statement that "the immune system is a circulating nervous system." Although he was not referring directly to chiropractic, this in fact is the basis of chiropractic care! The body has the innate power to heal itself, and that all happens through a properly functioning nervous system.
You can listen to the whole audio here.
Health and happiness!