![]() In certain medical conditions such as damage to the glossopharyngeal nerve and the vagus nerve, the gag reflex is absent. However, in that case, the sensory limb of the reflex is the CN V (trigeminal nerve). Touching the soft palate can lead to a similar reflex response. respiratory tract) apart from those essential in swallowing. The gag reflex involves a brisk and brief elevation of the soft palate and bilateral contraction of pharyngeal muscles evoked by touching the posterior pharyngeal wall. The gag reflex is an important mechanism that prevents objects in the oral cavity from. This reflex is one of the natural preventive mechanisms that the body employs against objects in the mouth to reach other organs (e.g. The glossopharyngeal and vagus nerves also play a role in the gag reflex. The gag reflex is the closing of the and the cessation of evoked by stimulation of the sensory nerves in the oral cavity or pharynx by. The soft palate elevates and the pharyngeal muscles contract bilaterally. ![]() In particular, contact with the posterior pharyngeal wall leads to a retching or gagging. It has a role in heart rate, speech, the gag reflex, the transfer of food from the mouth to stomach, transporting food through the intestines, perspiration, and other bodily functions. ![]() The central nervous system responds by activating the effector cells via the efferent nerve. The vagus nerve runs from the brain into the torso, heart, lungs, intestines, and several muscles, including those involved in swallowing. The afferent limb of the reflex is supplied by the glossopharyngeal nerve (cranial nerve IX), which inputs to the nucleus solitarius and the spinal trigeminal. The nerves take it as an external stimulus and then send a message to the central nervous system through the afferent nerve. Gag reflex is a reflex contraction that occurs when a foreign body comes in contact with the mucous membrane of the throat. ![]() Reflex is an automatic instinctive unlearned reaction to a stimulus. A reflex contraction characterized by retching or gagging when a foreign body comes in contact with the mucous membrane at the back of the throat, activating a sensory receptor that sends signals to the central nervous system, which ultimately activates effector cells to carry out appropriate responses that characterize the reflex Lesions of the glossopharyngeal nerve would result in loss of the pharyngeal (gag) reflex because the glossopharyngeal nerve contains somatosensory. ![]()
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