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 ?
Traumatic neuromas of the head and neck have been reported in the oral cavity, the maxillary division of the trigeminal nerve, the inferior alveolar nerve of the mandible, the auriculotemporal nerve, the glossopharyngeal nerve, and the facial nerve.
Eagle believed that the scar tissue incorporated branches of the glossopharyngeal nerve.
Sensory innervation of the pharyngeal orifice of the eustachian tube is complex and is predominantly supplied by the glossopharyngeal nerve.
The innervation of the parotid involves the preganglionic parasympathetic portion of the gland, beginning in the inferior salivatory nucleus and passing via the glossopharyngeal nerve, the tympanic plexus, and the lesser petrosal nerve to the oticganglion.
Additionally, histopathologic findings in patients with respiratory weakness and WNV infection have demonstrated neuronophagia and leukocytic inflammation of the dorsal motor nuclei of the vagus and glossopharyngeal nerves, which is similar to that seen in the spinal anterior horns (26).
The Company holds the rights to numerous device patents covering the generator and electrode and method patents covering the application of a pulsed electrical signal to the vagus, trigeminal and glossopharyngeal nerves for the treatment of a variety of disorders including epilepsy, depression, Alzheimer's Disease, anxiety, headache and pain, eating disorders and congestive heart failure.