![]() The gag reflex is mediated by the glossopharyngeal nerve (CN IX) and the vagus nerve (CN X). Contrast this with a hypersensitive gag reflex (HGR), which may be caused by anxiety, postnatal drip, acid reflux, or oral stimulation, such as during dental treatments. In certain instances, a lack of a gag reflex may be a symptom of a more severe medical condition, such as cranial nerve damage or brain death. It is an essential component of evaluating the medullary brainstem and plays a role in the declaration of brain death. The gag reflex is believed to be an evolutionary reflex that developed as a method to prevent swallowing foreign objects and prevent choking. For additional information visit Linking to and Using Content from MedlinePlus.The gag reflex, also known as the pharyngeal reflex, is an involuntary reflex involving bilateral pharyngeal muscle contraction and elevation of the soft palate. This reflex may be evoked by stimulation of the posterior pharyngeal wall, tonsillar area, or base of the tongue. Any duplication or distribution of the information contained herein is strictly prohibited without authorization. Links to other sites are provided for information only - they do not constitute endorsements of those other sites. A licensed physician should be consulted for diagnosis and treatment of any and all medical conditions. The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. This site complies with the HONcode standard for trustworthy health information: verify here. Learn more about A.D.A.M.'s editorial policy editorial process and privacy policy. is among the first to achieve this important distinction for online health information and services. follows rigorous standards of quality and accountability. ![]() is accredited by URAC, for Health Content Provider (URAC's accreditation program is an independent audit to verify that A.D.A.M. Vision changes, such as reduced vision, decreased visual field, sudden vision loss, double vision (diplopia)Ī.D.A.M., Inc.Speech or language difficulties, such as aphasia (a problem understanding or producing words) or dysarthria (a problem making the sounds of words), poor enunciation, poor understanding of speech, difficulty writing, lack of ability to read or understand writing, inability to name objects (anomia).Poor gag reflex, swallowing difficulty, and frequent choking.Loss of coordination or loss of fine motor control (ability to perform complex movements).Not paying attention to your surroundings or a part of the body (neglect).Horner syndrome: small pupil on one side, one-sided eyelid drooping, lack of sweating on one side of the face, and sinking of one eye into its socket.Other examples of focal loss of function include: Sensation changes, including paresthesia (abnormal sensations), numbness, or decreases in sensation. ![]()
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