Glossopharyngeal nerve

(BQ) Continued part 1, part 2 of the document Cranial nerves anatomy, pathology, imaging presents the following contents: Facial nerve, vestibulocochlear nerve, glossopharyngeal nerve, vagus nerve, accessory nerve, hypoglossal nerve.

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Theafferent limb includes receptors within the sensory distribution of the trigeminal, glossopharyngeal, superior laryngeal, and vagus nerves. The efferent limb includes the recurrent laryngeal nerve and the spinal nerves. The cough starts with a deep inspiration followed by glottic closure, relaxation of the diaphragm, and muscle contraction against a closed glottis. The resulting markedly positive intrathoracic pressure causes narrowing of the trachea.

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Case report: A large dumbbell glossopharyngeal schwannoma involvin vagus nerve: a case report and review of the literature

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Migrainous neuralgia may be localized to the mouth. Episodes of pain and remission without identifiable cause and absence of relief with local anesthesia are important clues. Trigeminal neuralgia (tic douloureaux) may involve the entire branch or part of the mandibular or maxillary branches of the fifth cranial nerve and produce pain in one or a few teeth. Pain may occur spontaneously or may be triggered by touching the lip or gingiva, brushing the teeth, or chewing. Glossopharyngeal neuralgia produces similar acute neuropathic symptoms in the distribution of the ninth cranial nerve.

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Glossopharyngeal Neuralgia Syncope due to glossopharyngeal neuralgia (Chap. 371) is preceded by pain in the oropharynx, tonsillar fossa, or tongue. Loss of consciousness is usually associated with asystole rather than vasodilatation. The mechanism is thought to involve activation of afferent impulses in the glossopharyngeal nerve that terminate in the nucleus solitarius of the medulla and, via collaterals, activate the dorsal motor nucleus of the vagus nerve.

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