Canaliculus chordae tympani.

The radiographic appearance of the petrotympanic fissure, through whic h the chorda tympani nerve exits the tympanic cavity, is familiar to radiologists as a normal struc ture, not to be mistaken for a frac ture of the anterior wall of the external auditory canal [1, 2). However, th e rad iographic demonstration of the canaliculus chordae tympan i, the bony canal which transmits the chorda tympani nerve from its facial nerve origin to where it enters the tympanic