Fig. 1. Sphenopalatine ganglion as seen in pterygopalatine fossa through pterygomaxillary fissure (Source: Khonsary SA, Ma Q, Villablanca P, Emerson J, Malkasian D. Clinical functional anatomy of the pterygopalatine ganglion, cephalgia and related dysautonomias: a review. Surg Neurol Int 2013; 4: S422-8).