{"id":1331,"date":"2020-08-05T21:10:57","date_gmt":"2020-08-05T21:10:57","guid":{"rendered":"https:\/\/meddists.com\/learn\/pre-clinical\/anatomy\/head-and-neck\/neurovasculature\/innervation\/glossopharyngeal-nerve-cn-ix\/"},"modified":"2022-07-31T13:42:45","modified_gmt":"2022-07-31T11:42:45","slug":"glossopharyngeal-nerve-cn-ix","status":"publish","type":"page","link":"https:\/\/meddists.com\/learn\/pre-clinical\/anatomy\/skull-head-and-neck\/neurovasculature\/innervation\/glossopharyngeal-nerve-cn-ix\/","title":{"rendered":"Glossopharyngeal nerve (CN IX)"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><div class=\"intro\">The glossopharyngeal nerve participates in the innervation of structures in the glossus (tongue) and the pharynx, as well as the middle ear, and parasympathetic innervation.<\/div><\/p>\n\n\n<span class=\"block-heading\" id=\"header_1\">\n<h4 class=\"wp-block-heading\" class=\"wp-block-heading\" class=\"title_collection title1\">Course<\/h4>\n<\/span><span class=\"block-content\" id=\"contents_1\">\n\n\n<ol class=\"wp-block-list\"><li>The glossopharyngeal nerve leaves the cranium through the anterior jugular foramen.<\/li><li>It gives off the <strong>tympanic branch<\/strong>:<ul><li>Also known as <strong>Jacobson&#8217;s nerve<\/strong>, which has both sensory and parasympathetic fibers.<\/li><li>It passes through the petrous part of the temporal bone via the tympanic canaliculus, forming the tympanic plexus and then becomes the<strong>\u00a0lesser petrosal nerve<\/strong><\/li><\/ul><ul><li>The lesser petrosal nerve leaves the cranium through foramen ovale and provides presynaptic parasympathetic fibers to the otic ganglion, which will innervate the parotid gland via the association of the otic ganglion with branches of the mandibular nerve (CN V3), namely the\u00a0<strong>auriculotemporal nerve<\/strong><\/li><\/ul><\/li><li>It descends down the neck, following the stylopharyngeus muscle, and innervating it (the only muscle innervated by CN IX!)<\/li><li>It passes between the superior and middle constrictor muscles, descending and branching out to reach the tonsils, pharynx, tongue, and the carotid body and sinus, innervating them.<ul><li>The tonsillary and pharyngeal branches receive sensory information from the tonsils.<\/li><li>The lingual branch receives sensory and special viscerosensory (taste) information from the anterior 1\/3 of the tongue.<\/li><li>The carotid branch (also known as <strong>Hering&#8217;s nerve<\/strong>) receives viscerosensory information from the carotid body and sinus regarding the blood pressure and its chemical composition.<\/li><\/ul><\/li><\/ol>\n\n\n\n<figure class=\"wp-block-image\"><a href=\"http:\/\/meddists.com\/wp-content\/uploads\/2018\/08\/glossopharyngeal_nerve.png\" target=\"_blank\" title=\"Glossopharyngeal nerve (CN IX)\"><img decoding=\"async\" src=\"http:\/\/meddists.com\/wp-content\/uploads\/2018\/08\/glossopharyngeal_nerve.png\" alt=\"\" class=\"wp-image-4635\"\/><\/a><figcaption><strong>Schematic drawing of the glossopharyngeal nerve<\/strong><\/figcaption><\/figure>\n\n\n<\/span><span class=\"block-heading\" id=\"header_2\">\n<h4 class=\"wp-block-heading\" class=\"wp-block-heading\" class=\"title_collection title1\">Summary<\/h4>\n<\/span><span class=\"block-content\" id=\"contents_2\">\n\n\n<figure class=\"wp-block-table\"><table class=\"pure-table\"><tbody><tr><td><strong>Branch<\/strong><\/td><td><strong>Function<\/strong><\/td><td><strong>Structure<\/strong><\/td><\/tr><tr><td>Tympanic<\/td><td>Sensory and parasympathetic<\/td><td>Middle ear and otic  ganglion<\/td><\/tr><tr><td>N. to stylopharyngeous<\/td><td>Motor<\/td><td>Stylopharyngeous muscle<\/td><\/tr><tr><td>Tonsillary<\/td><td>Sensory<\/td><td>Tonsils<\/td><\/tr><tr><td>Pharyngeal<\/td><td>Sensory<\/td><td>Oropharynx<\/td><\/tr><tr><td>Lingual<\/td><td>Sensory and special viscerosensory (taste)<\/td><td>Anterior 1\/3 of the tongue<\/td><\/tr><tr><td>Carotid<\/td><td>Visceral sensory<\/td><td>Carotid sinus and body<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/span><div id=\"the_titles\" style=\"display:none;\"><h4 class=\"wp-block-heading\" class=\"wp-block-heading\">Course<\/h4><h4 class=\"wp-block-heading\" class=\"wp-block-heading\">Summary<\/h4><\/div>","protected":false},"excerpt":{"rendered":"<p>Course The glossopharyngeal nerve leaves the cranium through the anterior jugular foramen. It gives off the tympanic branch: Also known as Jacobson&#8217;s nerve, which has both sensory and parasympathetic fibers. It passes through the petrous part of the temporal bone via the tympanic canaliculus, forming the tympanic plexus and then becomes the\u00a0lesser petrosal nerve The [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":1159,"menu_order":6,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-1331","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Glossopharyngeal nerve (CN IX) &#8211; Meddists<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/meddists.com\/learn\/pre-clinical\/anatomy\/skull-head-and-neck\/neurovasculature\/innervation\/glossopharyngeal-nerve-cn-ix\/\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/meddists.com\\\/learn\\\/pre-clinical\\\/anatomy\\\/skull-head-and-neck\\\/neurovasculature\\\/innervation\\\/glossopharyngeal-nerve-cn-ix\\\/\",\"url\":\"https:\\\/\\\/meddists.com\\\/learn\\\/pre-clinical\\\/anatomy\\\/skull-head-and-neck\\\/neurovasculature\\\/innervation\\\/glossopharyngeal-nerve-cn-ix\\\/\",\"name\":\"Glossopharyngeal nerve (CN IX) &#8211; 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