Clinical role and advantages of superior laryngeal nerve block guided by ultrasound
lateral branch, cough, glottis fissure, laryngeal spasm, epiglottis
LARYNGEAL SPASM
The superior laryngeal nerve originates from the inferior ganglion of the vagus nerve on both sides of the neck and is divided into medial and lateral branches. The medial branch is the sensory nerve, which passes through the thyroglossal membrane and distributes in the laryngeal mucosa, epiglottis and tongue root above the glottis fissure. It is also the afferent nerve branch of cough and laryngeal spasm reflex. The lateral branch is the motor nerve, which innervates cricothyroid muscle and pharyngeal constrictor muscle [