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11 gru 2020 · Damage to lower motor neurons can result in a wide variety of symptoms based on the cranial nerve that is damaged. For example, cranial nerve IX (the glossopharyngeal nerve) is involved in salivation, swallowing, and the gag reflex. If cranial nerve IX is injured, it can lead to difficulty swallowing (dysphagia) and a reduced gag reflex.
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7 lis 2022 · The glossopharyngeal nerve is the 9th cranial nerve (CN IX). It is 1 of the 4 cranial nerves with sensory, motor, and parasympathetic functions. It originates from the medulla oblongata and terminates in the pharynx.
The nuclei of cranial nerves IX and X receive bilateral input from the cortex, and unilateral lesions are often asymptomatic. Bilateral lesions of the corticobulbar tracts result in pseudobulbar palsy. Symptoms include slow, dysarthric speech and variable dysphagia, while pharyngeal and palatal reflexes remain intact.
The glossopharyngeal nerve is the ninth set of 12 cranial nerves (CN IX). It provides motor, parasympathetic and sensory information to your mouth and throat. Among its many functions, the nerve helps raise part of your throat, enabling swallowing.
Glossopharyngeal nerve lesions produce difficulty swallowing; impairment of taste over the posterior one-third of the tongue and palate; impaired sensation over the posterior one-third of the tongue, palate, and pharynx; an absent gag reflex; and dysfunction of the parotid gland.
Structure. From 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. From the superior and inferior ganglia in jugular foramen, it has its own sheath of dura mater.
22 maj 2017 · Bilateral lesions may give rise to pseudobulbar palsy characterized by dysphagia, spastic dysarthria, and pathologic bursts of crying with loss of emotional control. Dysfunctional or absence of gag reflex may indicate CN IX paralysis (tongue retraction and elevation of the pharynx).
