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Chorda Tympani Nerve Summary

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Type of article: Original Article (Case Report) Title of the article: Anomalous course of Chorda Tympani nerve: An Operative Finding Running title: . Anomalous course of Chorda Tympani nerve. Contributors : 1. Dr. Bisht S Ravindra (1) MS (ENT). 2. Alok Saxena(2) M.Sc (Medical Anatomy) 3. Dr. Vikas Sikarwar (1) MS (ENT). Departments and institution: 1) Department of Otorhinolaryngology VCSGGMS&RI, Srinagar Pauri Garhwal, Uttrakhand 2) Department of Anaotmy VCSGGMS&RI,Srinagar Pauri Garhwal, Uttrakhand. 1 .Name: Dr. Ravindra Singh Bisht Address: Department of ENT VCSGGMS&RI,Srinagar Pauri Garhwal, Uttrakhand …show more content…

It traverses the tympanic cavity and leaves the temporal bone to join lingual nerve after passing through petrotympanic fissure (1). It carries taste sensation from the anterior two third of the tongue and secretomotor fibres to submandibular salivary gland. Long course of chorda tympani makes it venerable to injury during various middle ear surgeries. There are various factors causing injury to the chorda tympani like transaction, stretching (most common mechanism), ischemia, thermal injury, excessive handling and desiccation (2). Loss or altered taste sensation with or without xerostomia is the classical features of chorda tympani injury. Electrogustometry is done to measure its gustatory function …show more content…

There are two small openings, anterior and posterior canaliculi for the chorda tympani nerve and petrotympanic fissure in the upper part of this ring. Chorda tympani enters in tympanic cavity through posterior canaliculi and exits through anterior canaliculi which opens at the medial end of petrotympanic fissure (4). Very few studies have described the variations in the origin and course of chorda tympani. A study conducted on 200 specimens of human temporal bones revealed the variant origin of chorda tympani. It was located in the proximal third (in 20 % cases), middle third (in 70% cases) and in distal third (10% cases) of mastoid segment of facial nerve (1). A cadaveric study showed the origin of chorda tympani from facial nerve outside the skull (in 6/40 specimens) and from within the facial canal (in 34/40 specimens) (5). Chorda tympani was observed between tympanomeatal flap and bone during tympanoplasty surgery

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