The treatment of certain diseases by stimulation or anesthetic blocking of the sphenopalatine (relating to the sphenoid [irregularly shaped bone in front of the occipital in the base of the skull] and the palatine [irregularly shaped bone behind the maxilla or upper jaw] bones) ganglia (group of nerve cell bodies, usually located outside the brain and spinal cord), particularly applicable in psychosomatic disorders thought by some to be mediated through the sympathetic nervous system.