chorda tympani


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chorda

 [kor´dah] (pl. chor´dae) (L.)
a cord or sinew. adj., adj chor´dal.
chorda mag´na Achilles tendon.
chor´dae tendi´neae tendinous cords connecting the two atrioventricular valves to the appropriate papillary muscles in the heart ventricles.
Chordae tendineae of the posterior cusps of atrioventricular valves in a cross-section of the heart. From Dorland's, 2000.
chorda tym´pani a nerve originating from the facial nerve, distributed to the submandibular, sublingual, and lingual glands and the anterior two-thirds of the tongue; it is a parasympathetic and special sensory nerve.
chorda umbilica´lis umbilical cord.
chorda voca´lis vocal cord.

chor·da tym·'pa·ni

[TA]
a nerve given off from the facial nerve in the facial canal that passes through the posterior canaliculus of the chorda tympani into the tympanic cavity, crosses over the tympanic membrane and handle of the malleus, and passes out through the anterior canaliculus of the chorda tympani in the petrotympanic fissure to join the lingual branch of the mandibular nerve in the infratemporal fossa; it conveys taste sensation from the anterior two thirds of the tongue and carries parasympathetic preganglionic fibers to the submandibular ganglion, for innervation of the submandibular and sublingual salivary glands.

chor·da tym·pa·ni

(kōr'dă tim'pan-ī) [TA]
A nerve given off from the facial nerve in the facial canal that passes through the posterior canaliculus of the chorda tympani into the tympanic cavity, crosses over the tympanic membrane and handle of the malleus, and passes out through the anterior canaliculus of the chorda tympani in the petrotympanic fissure to join the lingual branch of the mandibular nerve in the infratemporal fossa; it conveys taste sensation from the anterior two thirds of the tongue and carries parasympathetic preganglionic fibers to the submandibular ganglion, for innervation of the submandibular and sublingual salivary glands.

chor·da tym·pa·ni

(kōr'dă tim'pan-ī) [TA]
Nerve given off from the facial nerve in the facial canal; conveys taste sensation from the anterior two thirds of the tongue and carries parasympathetic preganglionic fibers to the submandibular ganglion, for innervation of submandibular and sublingual salivary glands.
References in periodicals archive ?
The prognostic factors were patient age (<60/[greater than or equal to]60 years), staging (I-IV), S1 involvement, S2 involvement, T involvement, M involvement, development of mastoid cells (MC0-1/MC2-3), pathological status of the stapes (S0/S1), surgical procedure (CWU/CWD), malleus handle (present/absent), chorda tympani nerve (present/absent), and middle ear mucosa (normal/diseased).
Sense of taste can also be affected in association with contact of the lingual and chorda tympani nerve, although there have been very few reports of the chorda tympani nerve being affected.
Post-OP AB GAP Number of Cases < 10 dB 28 11-20 dB 09 > 21 dB 03 Complications following Endoscopic Stapedotomy Number of Complications in Endoscopic Stapedotomy Vertigo 5 Injury to Chorda Tympani 0 SNHL 1 Labyrinthine damage causing vertigo occurred in 5 patients, which is transient, and all are free of symptoms after one to two weeks.
Novice group Expert group n = 58 n = 15 Total injuries 894 125 9 (5.25-15.75) 6 (4.5-11) Injury of the dura 175 45 1.5 (1-3.75) 3 (1.5-4) Injury of the sigmoid sinus 81 30 0.5 (0-2) 1 (0-2.5) Injury to the brain 20 9 0 (0-0) 0 (0-1) Injury of the auditory ossicles 218 37 2.5 (1-5.75) 2 (1-3.5) Injury of the vestibular labyrinth 65 2 0 (0-1) 0 (0-0) Injury of the chorda tympani 2 0 0 (0-0) 0 (0-0) Injury of the facial nerve 8 0 0 (0-0) 0 (0-0) Injury of the posterior wall of 325 2 the outer ear canal * 1 (0-3) 0 (0-0) Results represent occurrence and median (interquartile range).
34.7% of the patients reported dysgeusia due to chorda tympani involvement, and the 37.9% of the total was affected by dry eye for the involvement of the greater superficial petrosal nerve.
To elucidate the neural mechanisms of such age-related changes in taste preference and sensitivity, electrophysiological experiments examined taste response characteristics of chorda tympani nerves.
This is supported by the observation of relatively greater alteration in bitter and sour taste sensation than salty and sweet perception with terbinafine in various studies.4,5 Electrophysiological study of chorda tympani nerve in non human primates shows that more sucrose-based and NaCl-based fibres are present than citric acid based and caffeine- based fibres.6
If the lesion is proximal to the geniculation ganglion, the motor paralysis is accompanied by gustatory and autonomic abnormalities, while lesion between the geniculate ganglion and the origin of chorda tympani produces same effects, except that lacrimation is spared.
Calcification leads to compression of the adjacent structures that are innervated by the glossopharyngeal, trigeminal and chorda tympani nerves.
Atn= Auriculotemporal nerve, Bn= Buccal nerve, Ct= Chorda tympani,