Sensory nerve supply of larynx below the level of vocal cord is:
External branch of superior laryngeal nerve
Internal branch of superior laryngeal nerve
Recurrent laryngeal nerve
Inferior pharyngeal
Nerve supply of larynx

Sensory:

––The internal laryngeal nerve supplies the mucous membrane up to the level of the vocal folds.
––The recurrent laryngeal nerve supplies below the level of the vocal folds.

Motor:

––All intrinsic muscles of the larynx are supplied by the recurrent laryngeal nerve except for the cricothyroid
which is supplied by the external laryngeal nerve.