A reminder of one of the joys of summer! The term [sphenopalatine ganglioneuralgia] is a fancy medical term for "brain freeze". which happens when we eat or drink very cold food.
The etymology of the term is complex. [Sphen-] is a term meaning "wedge" and refers to the sphenoid bone. [-palatine-] means "pertaining to the palate" (and to the bones related to the hard palate].
The root term [-gangli-] refer to a ganglion, which is a concentration of neuronal bodies, neurons being the main cells of the nervous system. [-neur-] means "nerve", and the suffix [-algia] means "pain". Simply said, the term [sphenopalatine ganglioneuralgia] means "nerve pain of the sphenopalatine ganglion".
The sphenopalatine ganglion (Meckel's ganglion, nasal ganglion or pterygopalatine ganglion) is a parasympathetic ganglion found in the pterygopalatine fossa. It is largely innervated by the greater petrosal nerve (a branch of the facial nerve); and its neuronal axons innervate the lacrimal glands and nasal mucosa.
Not everybody accepts this theory. Some state that "brain freeze" occurs because of rapid cooling of the blood in the pharynx, causing a drop of temperature of the internal carotid artery, which in turn causes cooling and pain in the meninges related to the base of the cranium.
My thanks to Gina Burg, for bringing this term to my attention. Dr. Miranda
Thanks to Forrest J. Bonjo for the image and additional information. The article was originally stored at pdu.edu, but the server was closed. If you click on the image, this will take you to the article stored at web.archive.org.