Surgical anatomy of the chorda tympani: a micro-CT study.

Surgical and Radiologic Anatomy : SRA
L J McManusM D Stringer

Abstract

Iatrogenic injury of the chorda tympani is a well-known complication of middle ear surgery, yet few studies have investigated the intraosseous course of the nerve. The aim of this study was to accurately delineate the posterior canaliculus in the temporal bone, particularly its relationship to the tympanic annulus, which is critical during the insertion of subannular ventilation tubes. Forty temporal bones from 27 cadavers (15 male, mean age 75 years, 13 bilateral) were scanned using a micro-CT scanner, and standardised 3-D multiplanar reconstructions were generated using a software platform. The posterior canaliculus was measured in relation to reproducible bony landmarks. In 6 (15%) specimens, the chorda tympani originated from the facial nerve outside the skull and in 34 (85%) from within the facial canal at a mean of 3.2 ± 1.8 mm above the stylomastoid foramen. The posterior canaliculus was 12.3 ± 3.8 mm long and converged on the tympanic sulcus cranially. It entered the middle ear at 62 ± 10% of the height of the tympanic membrane. This novel micro-CT study defines the precise anatomy of the posterior canaliculus housing the chorda tympani and provides data that may help the otologic surgeon protect the nerve from iatrogen...Continue Reading

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Citations

Nov 17, 2015·The Journal of Laryngology and Otology·A K GuideraP J D Dawes
Jun 19, 2013·Acta Oto-laryngologica·Line WangDaoxing Zhang
Dec 7, 2014·Surgical and Radiologic Anatomy : SRA·Tymon SkadorwaBogdan Ciszek
Apr 9, 2015·Japanese Journal of Radiology·Dalveer SinghRhondda Jones
May 10, 2015·European Archives of Oto-rhino-laryngology : Official Journal of the European Federation of Oto-Rhino-Laryngological Societies (EUFOS) : Affiliated with the German Society for Oto-Rhino-Laryngology - Head and Neck Surgery·Harukazu HiraumiJuichi Ito
Feb 15, 2017·Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [and] European Academy of Otology and Neurotology·Tom WilliamsonStefan Weber
Feb 28, 2018·The Journal of Craniofacial Surgery·Selçuk GüneşBurak Olgun
Dec 5, 2020·Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [and] European Academy of Otology and Neurotology·Tsukasa UranakaTatsuya Yamasoba
Mar 21, 2021·Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [and] European Academy of Otology and Neurotology·Giulia MolinariLukas Anschuetz
Jul 1, 2020·Annals of Anatomy = Anatomischer Anzeiger : Official Organ of the Anatomische Gesellschaft·A Bert ChabotR Shane Tubbs

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