This lies on the second division of the fifth nerve, from which it gets its sensory root. Its motor root comes from the seventh by the great superficial petrosal nerve, and its sympathetic root from the carotid plexus by the branch joining this nerve. These enter the ganglion together, and are spoken of as the vidian nerve. Afferent (sensory) impulses, from the greater part of the nasal cavity, pass through this ganglion. Its efferent branches are - (1) motor to the elevator of the soft palate and azygos uvulae; (2) vasomotor, which comes from the sympathetic; and (3) secretory, which supply the glands of the cheek, etc.