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.

chorda tympani

a branch of the facial nerve that carries taste from the anterior two thirds of the tongue and parasympathetic innervation to all salivary glands below the level of the oral fissure.

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.

chorda

pl. chordae [L.] a cord or sinew.

chorda magna
Achilles tendon.
chorda tendineae
tendinous cords connecting the two atrioventricular valves to the appropriate papillary muscles in the heart ventricles.
Enlarge picture
Ruptured chorda tendineae in a horse heart at necropsy. By permission from Knottenbelt DC, Pascoe RR, Diseases and Disorders of the Horse, Saunders, 2003
chorda tendineae rupture
causes acute, massive, cardiac insufficiency leading to congestive heart failure and an early death; called also detachment.
chorda tympani
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 umbilicalis
umbilical cord.
chorda vocalis
vocal cord.
References in periodicals archive ?
9%) 8 (38%) (promontory, facial nerve, and tendon of the stapedius muscle) Understanding of the surgical steps No Partial Total Creation of the tympanomeatal flap - - 21 (100%) Access to the middle ear and preservation of the - - 21 (100%) chorda tympani Curettage of the bone wall in the posterosuperior - - 21 (100%) part of the external auditory canal (if necessary) Confirmation of stapes hypomobility, measurement of the distance from - 3 (14.
The other posterior tympanic spaces are: Posterior tympanic sinus which is present superiorly to sinus tympani, Facial recess which is present to vertical part of facial nerve and medial to chorda tympani nerve, Lateral tympanic sinus which is present inferior to facial recess.
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.
The researchers observed no significant differences in activity of the chorda tympani nerves by taste stimuli across the different age groups.
Primate sense of taste: behavioral and single chorda tympani and glossopharyngeal nerve fibre recordings in the rhesus monkey, Macaca mulatta.
size of peripheral receptive fields of single chorda tympani nerve
Thus, he lectured on curare; toxics and medicaments (Bernard, 1857), animal heat (Bernard, 1876), pancreas, diabetes, liver and glycogen synthesis (Bernard, 1853, 1877), chorda tympani and salivary secretion (Bernard, 1866), nervous system physiology and pathology, the great sympathetic nerve system (Bernard, 1858), fluids of the organism (Bernard, 1859), concepts of internal secretion and internal milieu and on general scientific subjects (Grmek, 1967: 248-264).
To explain the findings, lead researcher Linda Bartoshuk says repeated ear infections might permanently damage a nerve called the chorda tympani.
Moreover, this procedure precludes the types of injury to the chorda tympani nerve or middle ear structures that can occur in conventional myringoplasty.
The proposed pathophysiology includes paraesthesia of auditory nerve, vasospasm due to autonomic imbalance, irritation of tympanic plexus, hypersensitivity of chorda tympani nerve, sludging of blood, increased tension on inner ear fluids by middle ear muscles, intracellular oedema of the organ of Corti pushing hair cells to come into contact with the tectorial membrane, etc.
Ear surgeons are increasingly concerned about protecting the chorda tympani nerve while avoiding injury to the facial nerve during cochlear implant surgery.
In younger rats, injury to the chorda tympani nerve, which innervates the front of the tongue, typically prompts an infusion of immune cells called neutrophils to the injury site as well as surrounding tissue.