Glossopharyngeal Nerve


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Related to Glossopharyngeal Nerve: glossopharyngeal neuralgia

glossopharyngeal nerve

[¦gläs·ō·fə′rin·jē·əl ‚nərv]
(neuroscience)
The ninth cranial nerve in vertebrates; a paired mixed nerve that supplies autonomic innervation to the parotid gland and contains sensory fibers from the posterior one-third of the tongue and the anterior pharynx.

Glossopharyngeal Nerve

 

the ninth pair of cranial nerves. It consists of sensory, motor, and secretory fibers. The nuclei of the nerve are located in the medulla oblongata. The common trunk of the nerve emerges from the cranial cavity through the jugular foramen together with the vagus and accessory nerves and internal jugular vein.

The glossopharyngeal nerve supplies the mucous membrane of the radix linguae, pharynx, soft palate, eustachian tube, and tympanic cavity with sensory fibers. The taste fibers that innervate the posterior third of the tongue enter the peripheral portion of the taste receptors. The motor and secretory fibers innervate some pharyngeal muscles and the parotid gland, respectively. One of the sensory branches of the glossopharyngeal nerve also carries impulses from the carotid sinus, thereby participating in the regulation of blood circulation.

Injury to the glossopharyngeal nerve impairs swallowing and taste. In some cases, compression of the nerve causes neuralgia, manifested chiefly by pain in the regions innervated by it.

References in periodicals archive ?
The distribution of pain should be determined to ascertain the involvement of the glossopharyngeal nerve or its association with other cranial nerves.
In 1977, it became apparent that most of the cases of "idiopathic" glossopharyngeal neuralgia could be caused by vascular compression of the glossopharyngeal nerve at the nerve root entry zone, causing a hyperactive rhizopathy.
Bean-Lijewski, "Glossopharyngeal nerve block for pain relief after pediatric tonsillectomy: Retrospective analysis and two cases of life-threatening upper airway obstruction from an interrupted trial," Anesthesia and Analgesia, vol.
There was one report each of PRF application to Gasserian ganglion (25), sphenopalatine ganglion (26) and glossopharyngeal nerve (27).
In the current investigation, the long axis of the lateral surface of the CCG was crossed by the glossopharyngeal nerve. Dougherty et al.
Taste sensation from the taste buds is also supplied by the greater petrosal, vagus, and glossopharyngeal nerves, and it has been reported that cutting the chorda tympani nerve may abolish some inhibition of the glossopharyngeal nerve.
Autonomic dysfunction, in particular, the glossopharyngeal nerve which is the primary afferent neural pathway of the carotid body, could have caused a reduced ventilatory response to carbon dioxide and hypoxia.
In another study by Venkatesh and Umamaheshwara Rao.10 they suppressed both the stimuli independently--4% lignocaine spray to block vagal stimulation of larynx and glossopharyngeal nerve block to obtund the response to direct laryngoscopy.
The glossopharyngeal nerve and inferior petrosal sinus share the anterior compartment, the vagus nerve and accessory nerve lie within the middle compartment, while the large posterior compartment is occupied by the termination of the sigmoid sinus (Sinnatamby).
(10) Taste recovery may also occur because of compensation from other nerves, with the glossopharyngeal nerve maintaining constancy across areas of lost chorda tympani innervations.