Palatosphenoidal canal. The sphenopalatine artery has been displaced down along with its lateral and posterior nasal branches and nasal mucosa to expose and remove the sphenoidal process of the palatine bone. Removal of the sphenoidal process is a key step to open the palatosphenoidal canal and expose the palatosphenoidal artery, which typically grooves the pterygoid process. Note the spatial relationship of the palatosphenoidal artery with the vidian. (Image courtesy of JC Fernandez-Miranda)