![]() ![]() ![]() It then curves forward, forming an arch on the side of the neck and lying on 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 lower border of the stylopharyngeus muscle. It then passes between the internal jugular vein and internal carotid artery. The glossopharyngeal nerve exits the medulla oblongata from the postolivary sulcus, passes laterally across the flocculus, and leaves the skull through the pars nervosa of the jugular foramen in a separate sheath of the dura mater. These fibers are carried in the lesser petrosal nerve via the tympanic branch to the otic ganglion. The postganglionic fibers are distributed to the parotid gland via the auriculotemporal nerve. The autonomic parasympathetic fibers arise in the inferior salivary nucleus located in the dorsal pons.This nucleus supplies the stylopharyngeus muscle. The motor fibers originate in the upper part of the nucleus ambiguus in the rostral pons which receives bilateral supranuclear innervation from the corticobulbar fibers.spinal nucleus of the trigeminal nerve, located in the caudal aspect of the pons, which conveys somatic sensation.nucleus of the tractus solitarius, located in the dorsolateral medulla oblongata and lower pons, which conveys taste sensation from the posterior 3rd of the tongue and vallate papillae.The sensory ganglion cells lie in the superior and inferior ganglia of the nerve, whose central processes passing to two nuclei:.There are four cranial nerve nuclei in the lower pons and medulla that contribute to the glossopharyngeal nerve: ![]()
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