一、呃逆是如何发生的?呃逆是膈肌不自主的间歇性收缩运动,因空气突然被吸入呼吸道内,且同时伴有吸气期声门突然关闭,所以产生一种特有的声音。一般认为呃逆是一种神经反射动作,其反射中心位于第三第四节颈脊髓,受延髓呼吸中枢的控制。膈神经是膈肌的唯一运动神 Hiccup is how hiccups occur Hiccup is an involuntary intermittent diastolic movement of the diaphragm, because the air is suddenly inhaled into the respiratory tract, and accompanied by a sudden closure of the inspiratory door, it produces a unique sound. Hiccup is generally considered a reflex action, the reflection center is located in the third fourth cervical spinal cord, the medullary respiratory center control. The phrenic nerve is the only motor nerve of the diaphragm