Throat gag reflex cranial nerve8/11/2023 ![]() A communicating branch to the vagus nerve.Branches to the posterior third of tongue.From there, it passes under cover of the hyoglossus muscle and is finally distributed to the palatine tonsil, the mucous membrane of the fauces and base of the tongue, and the serous glands of the mouth. It then curves forward, forming an arch on the side of the neck and lying upon the stylopharyngeus and middle pharyngeal constrictor muscle. It descends in front of the latter vessel and beneath the styloid process and the muscles connected with it, to the posterior lower border of the stylopharyngeus muscle. In its passage through the foramen (with X and XI), the glossopharyngeal nerve passes between the internal jugular vein and internal carotid artery. ![]() On the inferior side, the glossopharyngeal nerve is lateral and anterior to the vagus nerve and accessory nerve. The inferior ganglion on the inferior surface of petrous part of temporal is related with a triangular depression into which the aqueduct of cochlea opens. From the superior and inferior ganglia in jugular foramen, it has its own sheath of dura mater. The motor division of the glossopharyngeal nerve is derived from the basal plate of the embryonic medulla oblongata, whereas the sensory division originates from the cranial neural crest.įrom the anterior portion of the medulla oblongata, the glossopharyngeal nerve passes laterally across or below the flocculus, and leaves the skull through the central part of the jugular foramen. ![]() Being a mixed nerve (sensorimotor), it carries afferent sensory and efferent motor information. The glossopharyngeal nerve ( / ˌ ɡ l ɒ s oʊ f ə ˈ r ɪ n( d) ʒ i ə l, - ˌ f ær ən ˈ dʒ iː ə l/ ), also known as the ninth cranial nerve, cranial nerve IX, or simply CN IX, is a cranial nerve that exits the brainstem from the sides of the upper medulla, just anterior (closer to the nose) to the vagus nerve. ![]()
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