Internal laryngeal nerve runs along which border of Pharyngeal muscle ?

Ans. is `c' i.e., Superior The internal branch of superior laryngeal nerve (internal laryngeal nerve) runs along the superior border of the inferior pharyngeal constrictor muscle and pierces the thyrohyoid membrane along with superior laryngeal vessels and enters the larynx.It is a sensory branch, which supplies mucous membrane of larynx above vocal folds and carries taste sensationtions from posterior-most pa of tongue (vallecula) and epiglottis.Internal laryngeal nerve is the afferent limb of cough reflex which is initiated if anything solid or liquid enters the larynx.The internal laryngeal nerve may be blocked with a local anaesthetic injected subcutaneously at the tip of greater cornu of hyoid bone as is required when an endotracheal tube is to be passed through the larynx into the trachea.