These GFP - labeled fibers were, however, only a subset of the total
gustatory innervation of the taste buds, as revealed by immunoreactivity for P2X3 (Fig. 3E).
Somatosensory
innervation of these taste fields arises from the trigeminal nerve; therefore, cells of the geniculate ganglion that innervate taste fields are
gustatory rather than somatosensory in function.