yökkäilyrefleksin

The yökkäilyrefleksi, commonly known in English as the gag reflex, is an involuntary physiological response that occurs when the back of the throat is stimulated. This reflex is a protective mechanism designed to prevent foreign objects from entering the airway and potentially causing choking. The sensation of nausea and the urge to vomit are characteristic of this reflex.

The reflex is triggered by tactile stimulation of the pharyngeal area, particularly the palatopharyngeal arch and the posterior pharyngeal wall. When these areas are touched, sensory nerves send signals to the brainstem, specifically the nucleus tractus solitarii. This processing then initiates a coordinated muscular response involving the pharynx, larynx, and diaphragm.

The physical manifestation of the yökkäilyrefleksi typically includes the contraction of pharyngeal muscles, elevation of the soft palate, and a sudden, forceful expulsion of air from the lungs. This can lead to retching or vomiting. While essential for preventing aspiration, the reflex can sometimes be overly sensitive in certain individuals, causing discomfort or distress during activities like eating, swallowing medication, or during dental or medical examinations. Conversely, a diminished or absent gag reflex can indicate neurological issues and poses a risk of aspiration.