Since attempts to inject the sphenopalatine ganglion are not always successful, it occurred to me that the roentgen ray could be used as an aid in the technic of injection. With this thought in mind, a roentgenray study of the pterygopalatine region was made. In this study, the following roentgenograms were made:
1. Views of the skull and adult head to show the pterygopalatine canal and the sphenopalatine foramen and their relation to adjacent structures.
2. Views of the skull with one probe in the pterygopalatine canal and another hooked in the sphenopalatine foramen through the middle meatus of the nose.
3. Views in clinical cases with needles introduced according to the methods of Dr. Ruskin and Dr. Sluder.
STUDIES OF THE SKULL
Figure 1 is a lateral view in which only half of the skull was used in order to eliminate, as much as possible, superimposing shadows. Figure