Change of somatosensory function of the tongue caused by chorda tympani nerve disorder after stapes surgery

2017 ◽  
Vol 128 (3) ◽  
pp. 701-706 ◽  
Author(s):  
Emi Maeda ◽  
Hirokazu Katsura ◽  
Tomomi Nin ◽  
Akiko Sakaguchi-Fukunaga ◽  
Yasuo Mishiro ◽  
...  
Keyword(s):  
Stapes Surgery ◽  
Chorda Tympani ◽  
Chorda Tympani Nerve ◽  
Somatosensory Function

scholarly journals Chorda tympani nerve management in endoscopic stapes surgery

2017 ◽  
Vol 18 (1) ◽  
pp. 1-4
Author(s):  
Ahmed Amin Omran ◽  
Ahmed Aly Ibrahim ◽  
Wael K.A. Hussein ◽  
Yasser Osman
Keyword(s):  
Stapes Surgery ◽  
Chorda Tympani ◽  
Chorda Tympani Nerve

scholarly journals Comparative study between microscopic and endoscopic stapes surgery

2017 ◽  
Vol 3 (2) ◽  
pp. 285 ◽  
Author(s):  
B. Harikumar ◽  
K. J. Arun Kumar
Keyword(s):  
Postoperative Pain ◽  
Operating Time ◽  
Surgical Techniques ◽  
Stapes Surgery ◽  
Stereoscopic Vision ◽  
Easy Access ◽  
Chorda Tympani ◽  
Chorda Tympani Nerve ◽  
Microscopic Surgery ◽  
Endoscopic Group

<p class="abstract"><strong>Background:</strong> To investigate whether endoscopic stapes surgery is safer and less invasive than conventional stapes surgery using an operating microscope.</p><p class="abstract"><strong>Methods:</strong> The subjects were 60 patients who were divided consecutively into group A undergoing microscopic stapedotomy and group B undergoing endoscopic stapedotomy. The procedures for endoscopic surgery were fundamentally the same as those for microscopic surgery, except for post aural incision used in some patients in microscopic group. The two surgical techniques were compared with respect to the operating time, approach, drilling of posterosuperior canal, manipulation of chorda tympani, visualisation of anterior crus, postoperative hearing, postoperative pain, and complications.  </p><p class="abstract"><strong>Results:</strong> There were no differences of operating time or postoperative hearing between the endoscopic and microscopic groups. There was very little postoperative pain in the endoscopic group. Drilling at the posterosuperior part of the external auditory canal was less extensive in the endoscopic group than in the microscopic group. Visualisation of anterior crus of stapes was good in endoscopic group.</p><p><strong>Conclusions:</strong> Endoscopic stapes surgeries are technically feasible, safe and promising. The main advantages were: easy access, virtually no trauma to the chorda tympani nerve and excellent vision. The disadvantages were the lack of stereoscopic vision, having to work with one hand only and the learning curve. </p>

scholarly journals Cell non-autonomous requirement of p75 in the development of geniculate oral sensory neurons

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Tao Tang ◽  
Christopher R. Donnelly ◽  
Amol A. Shah ◽  
Robert M. Bradley ◽  
Charlotte M. Mistretta ◽  
...  
Keyword(s):  
Sensory Neurons ◽  
Significant Loss ◽  
Taste Buds ◽  
Neurotrophin Receptor ◽  
P75 Neurotrophin Receptor ◽  
Chorda Tympani ◽  
Chorda Tympani Nerve ◽  
Tactile Stimuli ◽  
Oral Sensory ◽  
Nerve Recordings

AbstractDuring development of the peripheral taste system, oral sensory neurons of the geniculate ganglion project via the chorda tympani nerve to innervate taste buds in fungiform papillae. Germline deletion of the p75 neurotrophin receptor causes dramatic axon guidance and branching deficits, leading to a loss of geniculate neurons. To determine whether the developmental functions of p75 in geniculate neurons are cell autonomous, we deleted p75 specifically in Phox2b + oral sensory neurons (Phox2b-Cre; p75fx/fx) or in neural crest-derived cells (P0-Cre; p75fx/fx) and examined geniculate neuron development. In germline p75−/− mice half of all geniculate neurons were lost. The proportion of Phox2b + neurons, as compared to Phox2b-pinna-projecting neurons, was not altered, indicating that both populations were affected similarly. Chorda tympani nerve recordings demonstrated that p75−/− mice exhibit profound deficits in responses to taste and tactile stimuli. In contrast to p75−/− mice, there was no loss of geniculate neurons in either Phox2b-Cre; p75fx/fx or P0-Cre; p75fx/fx mice. Electrophysiological analyses demonstrated that Phox2b-Cre; p75fx/fx mice had normal taste and oral tactile responses. There was a modest but significant loss of fungiform taste buds in Phox2b-Cre; p75fx/fx mice, although there was not a loss of chemosensory innervation of the remaining fungiform taste buds. Overall, these data suggest that the developmental functions of p75 are largely cell non-autonomous and require p75 expression in other cell types of the chorda tympani circuit.

Systematic Review and Meta-analysis of Endoscopic vs Microscopic Stapes Surgery for Stapes Fixation

2021 ◽  
pp. 019459982199066
Author(s):  
Sandra Ho ◽  
Prayag Patel ◽  
Daniel Ballard ◽  
Richard Rosenfeld ◽  
Sujana Chandrasekhar
Keyword(s):  
Postoperative Complications ◽  
Meta Analysis ◽  
Stapes Surgery ◽  
Chorda Tympani Nerve ◽  
Stapes Fixation ◽  
Operative Outcomes ◽  
Significant Difference ◽  
The Mean ◽  
Postoperative Vertigo ◽  
Hearing Outcomes

Objective To systematically review the current literature regarding the operative outcomes of stapes surgery for stapes fixation via the endoscopic and microscopic approaches. Data Sources PubMed, Embase, and Web of Science. Review Methods An electronic search was conducted with the keywords “endoscop* or microscop*” and “stapes surgery or stapedectomy or stapedotomy or otosclerosis or stapes fixation.” Studies were included if they compared endoscopy with microscopy for stapes surgery performed for stapes fixation and evaluated hearing outcomes and postoperative complications. Articles focusing on stapes surgery other than for stapes fixation were excluded. Results The database search yielded 1317 studies; 12 remained after dual-investigator screening for quantitative analysis. The mean MINORS score was 18 of 24, indicating a low risk of bias. A meta-analysis demonstrated no statistically significant difference between the groups with regard to operative time, chorda tympani nerve manipulation or sacrifice, or postoperative vertigo. There was a 2.6-dB mean improvement in the change in air-bone gap in favor of endoscopic stapes surgery and a 15.2% increased incidence in postoperative dysgeusia in the microscopic group, but the studies are heterogeneous. Conclusions Endoscopic stapes surgery appears to be a reasonable alternative to microscopic stapes surgery, with similar operative times, complications, and hearing outcomes. Superior visibility with the endoscope was consistently reported in all the studies. Future studies should have standardized methods of reporting visibility, hearing outcomes, and postoperative complications to truly establish if endoscopic stapes surgery is equivalent or superior to microscopic stapes surgery.

Rate of Recovery of Taste Function after Preservation of Chorda Tympani Nerve in Middle Ear Surgery with Special Reference to Type of Disease

2003 ◽  
Vol 112 (1) ◽  
pp. 52-56 ◽  
Author(s):  
Masafumi Sakagami ◽  
Mieko Sone ◽  
Keijiro Fukazawa ◽  
Kojiro Tsuji ◽  
Yasuo Mishiro
Keyword(s):  
Recovery Of Function ◽  
Inflammatory Diseases ◽  
Chronic Otitis Media ◽  
Normal Function ◽  
Middle Ear Surgery ◽  
Chorda Tympani ◽  
Chorda Tympani Nerve ◽  
Taste Disturbance ◽  
Postoperative Symptoms ◽  
Rate Of Recovery

To study the recovery of function of the chorda tympani nerve, we examined by electrogustometry 79 patients (83 ears) with both preoperative normal function of the nerve and operative preservation of the nerve, every 2 days during hospitalization and at 6 months after surgery. For symptoms such as tongue numbness and taste disturbance, patients with noninflammmatory (NI) diseases (13/20 or 65.0%) showed a significantly higher rate of symptoms than did patients with chronic otitis media (COM; 13/35 or 37.1%) at 2 weeks after surgery (p = .032). The patients with NI diseases (5/20 or 25.0%) tended to show a higher rate of symptoms than did the COM patients (2/35 or 5.7%) or cholesteatoma patients (2/28 or 7.1%) at 6 months after surgery. The rate of recovery of the EGM threshold to normal at 2 weeks after surgery was significantly lower in NI disease patients (6/20 or 30.0%) than in COM patients (23/ 35 or 62.9%) or cholesteatoma patients (19/28 or 67.9%; p = .015 and .008, respectively). Thus, the patients with NI diseases had postoperative symptoms and elevation of EGM threshold more frequently than did the patients with inflammatory diseases.

Loss of sensitivity to low concentrations of NaCl following bilateral chorda tympani nerve sections in rats

1994 ◽  
Vol 19 (2) ◽  
pp. 169-184 ◽  
Author(s):  
Gwen B. O'Keefe ◽  
Juliann Schumm ◽  
James C. Smith
Keyword(s):  
Chorda Tympani ◽  
Chorda Tympani Nerve ◽  
Low Concentrations

Chorda tympani nerve, may it have a role in stabilizing middle ear pressure?

2013 ◽  
Vol 80 (6) ◽  
pp. 726-727 ◽  
Author(s):  
V. Rinaldi ◽  
M. Cappadona ◽  
M. Gaffuri ◽  
S. Torretta ◽  
L. Pignataro
Keyword(s):  
Middle Ear ◽  
Chorda Tympani ◽  
Chorda Tympani Nerve ◽  
Middle Ear Pressure

scholarly journals Regeneration of the Nerves in the Aerial Cavity with an Artificial Nerve Conduit -Reconstruction of Chorda Tympani Nerve Gaps-

PLoS ONE ◽  
2014 ◽  
Vol 9 (4) ◽  
pp. e92258 ◽  
Author(s):  
Toshiaki Yamanaka ◽  
Hiroshi Hosoi ◽  
Takayuki Murai ◽  
Takehiko Kobayashi ◽  
Yuji Inada ◽  
...  
Keyword(s):  
Nerve Conduit ◽  
Chorda Tympani ◽  
Chorda Tympani Nerve
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