When the chorda tympani
nerve was preserved, it was positioned on the double cartilage block to stabilize it.
The pathophysiology of the pain related to elongated SP was thought to be due to the compression of the nerves such as the lower branch of the trigeminal nerve, glossopharyngeal nerve and/or the chorda tympani
. The threshold for elongation is variable in the literature but 30 mm was considered as the threshold by many publications (5,21-23).
is not found to lie in the way of the endoscope, therefore there is a less chance of injury to it.
The stapedius tendon and chorda tympani
nerve are seen in the foreground.
Lingual nerve hyperfunction due to chorda tympani
alterations may be a possible cause (16).
Interestingly, in our study, the experts never injured fundamental structures like the facial nerve or chorda tympani
. This supports the observation that experts are less hesitant in approaching very close to structures at risk or even in touching them, according to their importance.
In PCI surgery, the edge of the drill hole is adjacent to important structures, such as facial nerves (FNs), chorda tympani
nerves (ChTs), the back wall of the external canal, and the auditory ossicles.
Along the NI via the chorda tympani
, sensory fibers derived from the gustatory receptors travel from the anterior two-thirds of the tongue, floor of the mouth, and palate, directed to the superior pole of the solitary nucleus in the medulla.
Considering the close relationship of the chorda tympani
nerve, it may also be compressed by the anomalous bar of bone and its involvement would result in abnormal taste sensation in the anterior two-thirds of the tongue .
During surgery, tearing of the chorda tympani
may lead to retrograde edema, and the heat effect of the laser can additionally provoke edema formation according to the macroscopic dehiscences in cases of laser-assisted stapes surgery .